.page-about {
  --ab-edge: rgba(255, 255, 255, 0.10);
  --ab-panel: #132238;
  --ab-glass: rgba(255, 255, 255, 0.05);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

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

.page-about .breadcrumbs span[aria-hidden] {
  color: var(--cyan);
  opacity: 0.65;
}

.page-about .breadcrumbs span[aria-current] {
  color: var(--text-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  position: relative;
  padding: 30px 0 40px;
  overflow: hidden;
  border-bottom: 1px solid var(--ab-edge);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -18% -10% auto -10%;
  height: 520px;
  background:
    radial-gradient(640px 320px at 8% 0%, rgba(0, 229, 212, 0.16), transparent 68%),
    radial-gradient(520px 260px at 88% 8%, rgba(255, 138, 61, 0.10), transparent 70%);
  pointer-events: none;
}

.page-about .about-cover__grid {
  position: relative;
  display: grid;
  gap: 26px;
}

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

.page-about .about-cover__kicker {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-cover__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 8.4vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-cover__title span {
  display: block;
}

.page-about .about-cover__text {
  margin: 0 0 24px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  transition: transform 0.16s var(--ease), background-color 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .btn--solid {
  background: var(--cyan);
  color: #04161B;
  border: 1px solid var(--cyan);
}

.page-about .btn--solid:hover {
  transform: translateY(-1px);
  background: #3DF0E3;
}

.page-about .btn--line {
  border: 1px solid var(--glass-line);
  color: var(--text);
  background: var(--ab-glass);
}

.page-about .btn--line:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .btn:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 3px;
}

.page-about .about-cover__card {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.015));
  padding: 18px;
}

.page-about .about-cover__card-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-cover__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-cover__facts > div {
  border-left: 1px solid var(--ab-edge);
  padding-left: 12px;
}

.page-about .about-cover__facts dt {
  margin-bottom: 5px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-cover__facts dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ---------- 档案夹布局 ---------- */
.page-about .dossier {
  display: grid;
  gap: 30px;
  padding: 40px 0 72px;
}

.page-about .dossier__aside {
  display: block;
  align-self: start;
}

.page-about .dossier__label {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .fold {
  margin-bottom: 10px;
  border: 1px solid var(--ab-edge);
  border-left: 3px solid rgba(0, 229, 212, 0.35);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--ab-panel);
}

.page-about .fold[open] {
  border-left-color: var(--cyan);
}

.page-about .fold__tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--text);
  transition: color 0.16s var(--ease);
}

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

.page-about .fold__tab::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--cyan);
}

.page-about .fold[open] .fold__tab::after {
  content: "–";
}

.page-about .fold__tab:hover {
  color: var(--cyan);
}

.page-about .fold__tab:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 2px;
}

.page-about .fold__no {
  padding: 1px 5px;
  border: 1px solid rgba(0, 229, 212, 0.4);
  border-radius: 4px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.10em;
  color: var(--cyan);
}

.page-about .fold__name {
  flex: 1;
  min-width: 0;
}

.page-about .fold__list {
  list-style: none;
  margin: 0;
  padding: 0 14px 12px;
}

.page-about .fold__link {
  display: block;
  position: relative;
  padding: 8px 0 8px 14px;
  border-left: 1px solid var(--ab-edge);
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .fold__link:hover {
  color: var(--text);
  border-left-color: var(--cyan);
}

.page-about .fold__link.is-current {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .fold__link:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 2px;
}

.page-about .dossier__hint {
  margin-top: 16px;
  padding: 14px;
  border: 1px dashed var(--ab-edge);
  border-radius: var(--radius-sm);
  background: var(--ab-glass);
}

.page-about .dossier__hint p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .dossier__hint-link {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 212, 0.5);
}

/* ---------- 章节骨架 ---------- */
.page-about .panel {
  padding: 30px 0;
  border-top: 1px solid var(--ab-edge);
  scroll-margin-top: 120px;
}

.page-about .panel:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .panel__head {
  margin-bottom: 22px;
}

.page-about .panel__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .panel__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 5vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .panel__sub {
  margin: 0;
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  display: grid;
  gap: 24px;
}

.page-about .tl__figure {
  margin: 0;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--board);
}

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

.page-about .tl__figure figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--ab-edge);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(0, 229, 212, 0.55), rgba(255, 255, 255, 0.10) 65%, rgba(255, 255, 255, 0));
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 20px 30px;
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .tl__item--now::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.15);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__item--now .tl__year {
  color: var(--orange);
}

.page-about .tl__name {
  margin: 7px 0 5px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
}

.page-about .tl__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 内容生产链路 ---------- */
.page-about .flow {
  display: grid;
  gap: 24px;
}

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

.page-about .flow__lead {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .num {
  font-family: var(--font-data);
  font-style: normal;
  font-weight: 600;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

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

.page-about .flow__step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px dashed var(--ab-edge);
}

.page-about .flow__step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .flow__no {
  padding-top: 2px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.10em;
  color: var(--cyan);
}

.page-about .flow__name {
  margin: 0 0 5px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow__figure {
  margin: 0;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--board);
}

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

.page-about .flow__figure figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--ab-edge);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 编辑部 ---------- */
.page-about .crew {
  display: grid;
  gap: 12px;
}

.page-about .crew__card {
  position: relative;
  padding: 18px 18px 16px;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  background: var(--ab-panel);
  overflow: hidden;
}

.page-about .crew__card--wide {
  background: linear-gradient(145deg, rgba(0, 229, 212, 0.12), rgba(19, 34, 56, 0.98) 58%);
  border-color: rgba(0, 229, 212, 0.28);
}

.page-about .crew__dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-bottom: 10px;
  border-radius: 50%;
}

.page-about .crew__dot--cyan {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 212, 0.14);
}

.page-about .crew__dot--gold {
  background: var(--tag-gold);
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.14);
}

.page-about .crew__dot--purple {
  background: var(--tag-purple);
  box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.16);
}

.page-about .crew__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .crew__desc {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .crew__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--ab-edge);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.10em;
  color: var(--muted);
}

/* ---------- 覆盖与分布 ---------- */
.page-about .cover-map {
  margin: 0 0 22px;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--board);
}

.page-about .cover-map__stage {
  position: relative;
  display: block;
}

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

.page-about .cover-map__points {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cover-map__point {
  position: absolute;
  transform: translate(-50%, -50%);
}

.page-about .cover-map__point:nth-child(1) { left: 15%; top: 34%; }
.page-about .cover-map__point:nth-child(2) { left: 31%; top: 64%; }
.page-about .cover-map__point:nth-child(3) { left: 47%; top: 28%; }
.page-about .cover-map__point:nth-child(4) { left: 63%; top: 60%; }
.page-about .cover-map__point:nth-child(5) { left: 77%; top: 36%; }
.page-about .cover-map__point:nth-child(6) { left: 89%; top: 66%; }

.page-about .cover-map__dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 212, 0.18);
  cursor: help;
  transition: transform 0.16s var(--ease);
}

.page-about .cover-map__dot:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 3px;
}

.page-about .cover-map__point--green .cover-map__dot {
  background: var(--tag-green);
  box-shadow: 0 0 0 4px rgba(124, 242, 155, 0.18);
}

.page-about .cover-map__point--purple .cover-map__dot {
  background: var(--tag-purple);
  box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.20);
}

.page-about .cover-map__point--gold .cover-map__dot {
  background: var(--tag-gold);
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.20);
}

.page-about .cover-map__point--magenta .cover-map__dot {
  background: var(--tag-magenta);
  box-shadow: 0 0 0 4px rgba(255, 107, 154, 0.20);
}

.page-about .cover-map__point--orange .cover-map__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.20);
}

.page-about .cover-map__point:hover .cover-map__dot {
  transform: scale(1.25);
}

.page-about .cover-map__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  z-index: 2;
  padding: 6px 10px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-sm);
  background: #0B1424;
  white-space: nowrap;
  font-size: 12px;
  line-height: 1.4;
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 6px);
  transition: opacity 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .cover-map__point:hover .cover-map__tip,
.page-about .cover-map__point:focus-within .cover-map__tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .cover-map figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--ab-edge);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .cover-stats {
  margin: 0 0 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .cover-stats > div {
  padding: 14px;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius-sm);
  background: var(--ab-panel);
}

.page-about .cover-stats dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .cover-stats dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .cover-regions {
  margin-bottom: 16px;
}

.page-about .cover-regions__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .cover-regions__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .cover-regions__list li {
  padding: 6px 12px;
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  background: var(--ab-glass);
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .cover-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .cover-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 212, 0.45);
}

/* ---------- 版本与维护 ---------- */
.page-about .cadence {
  display: grid;
  gap: 20px;
}

.page-about .cadence__stat {
  padding: 20px;
  border: 1px solid rgba(0, 229, 212, 0.28);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(0, 229, 212, 0.10), rgba(19, 34, 56, 0.98) 60%);
}

.page-about .cadence__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .cadence__unit {
  margin: 8px 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .cadence__desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .cadence__item {
  padding: 16px 18px;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  background: var(--ab-panel);
}

.page-about .cadence__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .cadence__item p {
  margin: 0 0 10px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .cadence__link {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 212, 0.45);
}

.page-about .cadence__link:hover {
  color: #fff;
  border-bottom-color: #fff;
}

.page-about .about-cta {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid var(--ab-edge);
  border-radius: var(--radius);
  background: var(--ab-glass);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .crew__card--wide {
    grid-column: span 2;
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 820px) {
  .page-about .tl {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 38px;
    align-items: center;
  }

  .page-about .cadence {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 26px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-cover {
    padding: 48px 0 64px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: 44px minmax(0, 1.3fr) minmax(300px, 0.72fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-cover__rail {
    display: block;
    grid-column: 1;
    min-height: 220px;
    padding-right: 14px;
    border-right: 1px solid var(--ab-edge);
    writing-mode: vertical-rl;
    font-family: var(--font-data);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--muted);
  }

  .page-about .about-cover__lead {
    grid-column: 2;
  }

  .page-about .about-cover__card {
    grid-column: 3;
    margin-top: 8px;
  }

  .page-about .dossier {
    grid-template-columns: 294px minmax(0, 1fr);
    gap: 52px;
    padding: 64px 0 96px;
    align-items: start;
  }

  .page-about .dossier__aside {
    position: sticky;
    top: 92px;
  }

  .page-about .panel {
    padding: 38px 0;
  }

  .page-about .panel:first-child {
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .fold__tab,
  .page-about .fold__link,
  .page-about .cover-map__dot,
  .page-about .cover-map__tip {
    transition: none;
  }

  .page-about .btn--solid:hover {
    transform: none;
  }

  .page-about .cover-map__point:hover .cover-map__dot {
    transform: none;
  }
}