.page-about {
  --about-gap: clamp(58px, 9vw, 112px);
  --about-measure: 34em;
  position: relative;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -0.005em;
  max-width: 20em;
  margin-top: 10px;
}

.page-about h3 {
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 3px;
}

.page-about .breadcrumbs {
  margin-bottom: 8px;
}

.page-about .about-mark {
  color: var(--ember);
  font-weight: 600;
}

/* ---------- 入口 ---------- */
.page-about .about-entry {
  padding-top: clamp(92px, 15vw, 152px);
  padding-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-entry__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: end;
}

.page-about .about-entry__copy > * + * {
  margin-top: 16px;
}

.page-about .about-entry h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 5.2vw, 58px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -0.01em;
  max-width: 14em;
}

.page-about .about-entry__lede {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(242, 247, 245, 0.88);
  max-width: var(--about-measure);
}

.page-about .about-entry__note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
  padding-left: 16px;
  border-left: 2px solid var(--hair-gold);
  max-width: var(--about-measure);
}

.page-about .about-entry__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--hair-gold);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 24px;
}

.page-about .about-entry__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-entry__facts .num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-entry__facts em {
  font-style: normal;
  font-size: 13px;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .about-entry__media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-l);
}

.page-about .about-entry__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 920px) {
  .page-about .about-entry__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-entry__media {
    aspect-ratio: 1 / 1.12;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-block: var(--about-gap);
  background: linear-gradient(180deg, transparent, rgba(15, 59, 74, 0.34) 42%, transparent);
}

.page-about .about-timeline__intro,
.page-about .about-coverage__intro,
.page-about .about-source__intro,
.page-about .about-versions__intro,
.page-about .about-index__intro {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 46em;
}

.page-about .about-timeline__origin {
  display: grid;
  gap: 24px;
  margin-top: clamp(34px, 5vw, 54px);
  align-items: center;
}

.page-about .about-timeline__origin-media {
  aspect-ratio: 10 / 7;
  border-radius: var(--radius-m);
}

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

.page-about .about-timeline__origin-text h3 {
  color: var(--white);
  margin-bottom: 10px;
}

.page-about .about-timeline__origin-text p {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 38em;
}

@media (min-width: 820px) {
  .page-about .about-timeline__origin {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: clamp(28px, 4vw, 56px);
  }
}

.page-about .about-timeline__band {
  margin-top: clamp(38px, 6vw, 68px);
  position: relative;
  height: clamp(110px, 22vw, 210px);
  overflow: hidden;
}

.page-about .about-timeline__band img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-timeline__band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--ink), transparent 18%, transparent 82%, var(--ink));
  pointer-events: none;
}

.page-about .about-timeline__scroller {
  margin-top: clamp(34px, 5vw, 56px);
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--gold) transparent;
  padding-bottom: 14px;
}

.page-about .about-timeline__scroller::-webkit-scrollbar {
  height: 5px;
}

.page-about .about-timeline__scroller::-webkit-scrollbar-thumb {
  background: rgba(216, 178, 106, 0.5);
  border-radius: 3px;
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  display: flex;
  width: max-content;
}

.page-about .about-timeline__node {
  flex: 0 0 clamp(196px, 58vw, 238px);
  padding: 22px 26px 0 0;
  border-top: 1px solid var(--hair-gold);
  position: relative;
  scroll-snap-align: start;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(216, 178, 106, 0.12);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.8vw, 27px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
  margin-bottom: 14px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__node h3 {
  color: var(--white);
  margin-bottom: 8px;
}

.page-about .about-timeline__node p {
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 收录范围 ---------- */
.page-about .about-coverage {
  padding-block: var(--about-gap);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(32px, 5vw, 54px);
}

.page-about .about-coverage__card {
  padding: 26px 24px 28px;
}

.page-about .about-coverage__card h3 {
  color: var(--white);
  font-size: 18px;
  margin-bottom: 12px;
}

.page-about .about-coverage__card > p {
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(242, 247, 245, 0.82);
}

.page-about .about-coverage__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-coverage__points {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-coverage__points li {
  position: relative;
  padding-left: 17px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-coverage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--lime);
}

@media (min-width: 900px) {
  .page-about .about-coverage__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-coverage__card:nth-child(1) {
    grid-column: 1 / 8;
  }

  .page-about .about-coverage__card:nth-child(2) {
    grid-column: 8 / 13;
    margin-top: 46px;
  }

  .page-about .about-coverage__card:nth-child(3) {
    grid-column: 2 / 8;
    margin-top: -26px;
  }

  .page-about .about-coverage__card:nth-child(4) {
    grid-column: 8 / 13;
    margin-top: 22px;
  }
}

/* ---------- 来源与校核 ---------- */
.page-about .about-source {
  position: relative;
  padding-block: var(--about-gap);
  background: rgba(16, 42, 37, 0.58);
}

.page-about .about-source::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(230, 216, 184, 0.07) 1px, transparent 1px);
  background-size: 7px 7px;
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-source .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-source__steps {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .about-source__steps li {
  display: grid;
  gap: 6px 18px;
  padding: 22px 0;
  border-top: 1px solid var(--hair-gold);
}

.page-about .about-source__steps li:last-child {
  border-bottom: 1px solid var(--hair-gold);
}

.page-about .about-source__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-source__steps h3 {
  color: var(--white);
}

.page-about .about-source__steps p {
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(242, 247, 245, 0.78);
  max-width: 44em;
}

@media (min-width: 760px) {
  .page-about .about-source__steps li {
    grid-template-columns: 58px minmax(0, 150px) minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .about-source__foot {
  margin-top: clamp(26px, 3.5vw, 40px);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 48em;
}

.page-about .about-source__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 255, 62, 0.32);
  padding-bottom: 1px;
}

.page-about .about-source__foot a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 维护团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-gap);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(30px, 4.5vw, 60px);
  align-items: start;
}

.page-about .about-team__total {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hair-gold);
}

.page-about .about-team__total .num {
  font-family: var(--font-mono);
  font-size: clamp(52px, 9vw, 92px);
  line-height: 0.9;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__total em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-team__split {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__split li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: rgba(242, 247, 245, 0.82);
}

.page-about .about-team__split .num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__body > * + * {
  margin-top: 16px;
}

.page-about .about-team__body p {
  font-size: 14.5px;
  line-height: 1.95;
  color: rgba(242, 247, 245, 0.8);
  max-width: 44em;
}

@media (min-width: 880px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  padding-block: var(--about-gap);
  background: linear-gradient(180deg, transparent, rgba(16, 42, 37, 0.42) 55%, transparent);
}

.page-about .about-ladder {
  list-style: none;
  margin: clamp(32px, 4.5vw, 54px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-ladder__item {
  display: grid;
  gap: 6px 20px;
  padding: 18px 22px;
  border-radius: var(--radius-s);
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(16, 42, 37, 0.92), rgba(16, 42, 37, 0.28));
  transition: background 0.32s var(--ease), transform 0.32s var(--ease);
}

.page-about .about-ladder__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ladder__text {
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(242, 247, 245, 0.82);
}

.page-about .about-ladder__item:hover,
.page-about .about-ladder__item:focus-within {
  background: linear-gradient(90deg, rgba(16, 42, 37, 1), rgba(15, 59, 74, 0.62));
  transform: translateX(6px);
}

@media (min-width: 780px) {
  .page-about .about-ladder__item {
    grid-template-columns: minmax(0, 92px) minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-ladder__item:nth-child(2) { margin-left: 3%; }
  .page-about .about-ladder__item:nth-child(3) { margin-left: 6%; }
  .page-about .about-ladder__item:nth-child(4) { margin-left: 9%; }
  .page-about .about-ladder__item:nth-child(5) { margin-left: 12%; }
  .page-about .about-ladder__item:nth-child(6) { margin-left: 15%; }
}

.page-about .about-versions__plan {
  margin-top: clamp(34px, 4.5vw, 52px);
  padding: 24px 0 0;
  border-top: 1px solid var(--hair-gold);
}

.page-about .about-versions__plan h3 {
  color: var(--gold);
  font-size: 14px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.page-about .about-versions__plan p {
  font-size: 14.5px;
  line-height: 1.92;
  color: rgba(242, 247, 245, 0.8);
  max-width: 52em;
}

.page-about .about-versions__plan a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 255, 62, 0.32);
  padding-bottom: 1px;
}

.page-about .about-versions__plan a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 档案目录 ---------- */
.page-about .about-index {
  padding-block: var(--about-gap) calc(var(--about-gap) * 0.9);
}

.page-about .about-index__list {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .about-index__list li {
  display: grid;
  gap: 4px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-index__list a {
  display: inline-block;
  font-size: 17px;
  font-weight: 600;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 255, 62, 0.28);
  padding-bottom: 2px;
  transition: border-color 0.26s var(--ease), color 0.26s var(--ease);
}

.page-about .about-index__list a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .about-index__list li > span:last-child {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-index__list li {
    grid-template-columns: 72px minmax(0, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 22px;
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-ladder__item {
    transition: none;
  }

  .page-about .about-ladder__item:hover,
  .page-about .about-ladder__item:focus-within {
    transform: none;
  }
}