.page-about {
  --rail: 88px;
  --about-measure: 68ch;
  background:
    radial-gradient(1100px 520px at 82% -8%, rgba(200, 244, 46, .055), transparent 68%),
    var(--ink);
  color: var(--text);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.75rem, 4vw, 3rem) 0;
}

.page-about .breadcrumb {
  margin-bottom: 1.25rem;
  font-size: .8rem;
  letter-spacing: .06em;
}

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

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

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  background:
    linear-gradient(180deg, rgba(16, 38, 28, .9), rgba(10, 26, 19, .6));
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  height: 10px;
  background-image: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

.page-about .about-hero__frame::before { top: 0; }
.page-about .about-hero__frame::after { bottom: 0; }

.page-about .about-hero h1 {
  margin: 1rem 0 1.1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.15rem, 7vw, 4.5rem);
  line-height: 1;
  letter-spacing: -.01em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0 0 1.9rem;
  max-width: 58ch;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.1rem;
  background: var(--char);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__media {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

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

/* ---------- 主体骨架：左刻度 + 右正文 ---------- */
.page-about .about-shell {
  margin-top: clamp(2.25rem, 6vw, 4rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 2.5rem);
}

.page-about .about-body-col {
  min-width: 0;
}

/* 移动端：横向滑动的胶囊索引 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__track {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}

.page-about .rail-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .5rem .95rem;
  border: 1px solid var(--rule);
  border-radius: var(--pill);
  background: var(--char);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .09em;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s ease, border-color .25s ease, background .25s ease;
}

.page-about .rail-link:hover {
  color: var(--lime);
  border-color: rgba(200, 244, 46, .45);
}

.page-about .rail-link.is-active,
.page-about .rail-link[aria-current="page"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-text);
}

.page-about .rail-num {
  font-size: .62rem;
  opacity: .8;
}

.page-about .rail-name {
  letter-spacing: .1em;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(1.9rem, 5vw, 3.5rem);
  border-top: 1px solid var(--rule);
  scroll-margin-top: 6.5rem;
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-chapter__head h2 {
  margin: .55rem 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -.005em;
  text-wrap: balance;
}

.page-about .about-chapter__lede {
  margin: .9rem 0 0;
  max-width: 60ch;
  font-size: 1.05rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-body p {
  margin: 0 0 1.05rem;
  max-width: var(--about-measure);
  line-height: 1.78;
}

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

.page-about .about-body strong {
  color: var(--lime-soft);
  font-weight: 700;
}

/* ---------- 覆盖地图 ---------- */
.page-about .about-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .about-map__figure {
  margin: 0;
  padding: clamp(.9rem, 3vw, 1.75rem);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--char), var(--ink));
}

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

.page-about .map-core {
  fill: var(--lime);
}

.page-about .map-core-label {
  fill: var(--ink-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: .04em;
  text-anchor: middle;
}

.page-about .map-ring {
  fill: none;
  stroke: var(--rule);
  stroke-width: 1.5;
}

.page-about .map-ring--main {
  stroke-dasharray: 1 9;
  stroke-linecap: round;
}

.page-about .map-ring--outer {
  stroke-dasharray: 4 12;
}

.page-about .map-node {
  fill: var(--panel);
  stroke: var(--lime);
  stroke-width: 2;
  transition: fill .25s ease;
}

.page-about .map-node-group:hover .map-node {
  fill: var(--lime);
}

.page-about .map-node-label {
  fill: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
}

.page-about .map-dot {
  fill: var(--muted);
  opacity: .65;
}

.page-about .map-note {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  text-anchor: middle;
}

.page-about .about-map__side {
  min-width: 0;
}

.page-about .about-map__note {
  margin: 0 0 1.1rem;
  max-width: 54ch;
  font-size: .975rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-map__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-about .about-map__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .8rem;
  padding: .6rem 1rem;
  border: 1px solid var(--rule);
  border-radius: var(--pill);
  background: var(--char);
  transition: border-color .25s ease;
}

.page-about .about-map__list li:hover {
  border-color: rgba(200, 244, 46, .4);
}

.page-about .about-map__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .about-map__dot--muted {
  background: var(--muted);
}

.page-about .about-map__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .02em;
}

.page-about .about-map__list .mono {
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .08em;
}

.page-about .about-map__item--ext {
  border-style: dashed;
}

/* ---------- 口径定义列表 ---------- */
.page-about .about-defs {
  display: grid;
  gap: .7rem;
}

.page-about .about-def {
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background: var(--char);
  overflow: hidden;
  transition: border-color .25s ease;
}

.page-about .about-def[open] {
  border-color: rgba(200, 244, 46, .35);
}

.page-about .about-def summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .85rem;
  padding: 1rem 1.15rem;
}

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

.page-about .about-def summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-def__code {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--lime);
}

.page-about .about-def__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .02em;
}

.page-about .about-def__toggle {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1px solid var(--rule);
  border-radius: 50%;
}

.page-about .about-def__toggle::before,
.page-about .about-def__toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  translate: -50% -50%;
  background: var(--lime);
}

.page-about .about-def__toggle::before {
  width: 8px;
  height: 1.5px;
}

.page-about .about-def__toggle::after {
  width: 1.5px;
  height: 8px;
  scale: 1 1;
  transition: scale .25s ease;
}

.page-about .about-def[open] .about-def__toggle::after {
  scale: 1 0;
}

.page-about .about-def__body {
  padding: 1rem 1.15rem 1.25rem;
  border-top: 1px solid var(--rule);
}

.page-about .about-def__body > p {
  margin: 0 0 .85rem;
  max-width: 62ch;
  font-size: .965rem;
  line-height: 1.78;
}

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

.page-about .about-def__misread {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .55rem;
  padding: .75rem .9rem;
  border-left: 2px solid var(--score);
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  background: rgba(255, 90, 46, .08);
}

.page-about .about-def__misread .label {
  color: var(--score);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-version {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: start;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
  transition: background .25s ease;
}

.page-about .about-version__no {
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--rule);
  font-variant-numeric: tabular-nums;
  transition: color .3s ease;
}

.page-about .about-version:hover .about-version__no {
  color: var(--lime);
}

.page-about .about-version__main {
  min-width: 0;
}

.page-about .about-version__main h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .01em;
}

.page-about .about-version__main p {
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-version .tag {
  justify-self: start;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: center;
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule);
  border-radius: var(--r-sm);
  background: var(--panel);
  transition: border-left-color .28s ease;
}

.page-about .about-role:hover {
  border-left-color: var(--lime);
}

.page-about .about-role h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .02em;
}

.page-about .about-role p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-role__count {
  margin-top: auto;
  padding-top: .5rem;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 编辑原则 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: 1rem 1.15rem;
  background: var(--char);
  font-size: .97rem;
  line-height: 1.75;
}

.page-about .about-rule__no {
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--lime);
  padding-top: .3rem;
}

/* ---------- 继续翻阅 ---------- */
.page-about .about-next .label {
  display: block;
  margin-bottom: 1rem;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-map {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
  }

  .page-about .about-version {
    grid-template-columns: 4.5rem minmax(0, 1fr) auto;
    gap: 1.5rem;
    align-items: center;
  }

  .page-about .about-version .tag {
    justify-self: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .about-rail__track {
    position: relative;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 1px;
  }

  .page-about .about-rail__track::before {
    content: "";
    position: absolute;
    left: 0;
    top: .55rem;
    bottom: .55rem;
    width: 1px;
    background: var(--rule);
  }

  .page-about .rail-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: .18rem;
    position: relative;
    padding: .78rem 0 .78rem 1.15rem;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--muted);
    white-space: normal;
    font-size: .68rem;
    line-height: 1.35;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 1.05rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--rule);
    transition: background .3s ease, box-shadow .3s ease;
  }

  .page-about .rail-link:hover {
    background: transparent;
    color: var(--lime);
  }

  .page-about .rail-link.is-active,
  .page-about .rail-link[aria-current="page"] {
    background: transparent;
    color: var(--lime);
  }

  .page-about .rail-link.is-active::before,
  .page-about .rail-link[aria-current="page"]::before {
    background: var(--lime);
    box-shadow: 0 0 0 4px rgba(200, 244, 46, .16);
  }

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

@media (min-width: 1080px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}