.page-about {
  --about-rail: 100px;
  --about-line: rgba(55, 245, 212, 0.22);
  --about-block: clamp(44px, 6vw, 84px);
  --about-soft: rgba(242, 245, 239, 0.86);
  overflow-x: clip;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  padding: clamp(24px, 4vw, 52px) 0 clamp(26px, 4vw, 46px);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 6.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 36em;
  color: var(--about-soft);
  line-height: 1.9;
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .hero-facts__value {
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1;
  color: var(--flo);
  letter-spacing: -0.02em;
}

.page-about .hero-facts__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* ---------- 通栏主图 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(8px, 1.6vw, 20px);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

/* ---------- 主体骨架 ---------- */
.page-about .story-shell {
  padding-top: var(--about-block);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .year-scale {
  display: none;
}

.page-about .story-chapter,
.page-about .story-next {
  padding-top: clamp(30px, 4vw, 54px);
  padding-bottom: clamp(40px, 6vw, 78px);
  border-top: 1px solid var(--line-soft);
}

.page-about .story-flow > :first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .chapter-num {
  display: block;
  font-size: clamp(44px, 8vw, 92px);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(55, 245, 212, 0.55);
}

@supports not (-webkit-text-stroke: 1px #ffffff) {
  .page-about .chapter-num {
    color: rgba(55, 245, 212, 0.4);
  }
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(23px, 3.1vw, 36px);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .story-lede,
.page-about .story-note {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 36em;
  color: var(--about-soft);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.9;
}

.page-about .story-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--lava);
  color: var(--mist);
  font-size: 14px;
}

/* ---------- 年份时间线 ---------- */
.page-about .era-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .era {
  position: relative;
  margin-left: 5px;
  padding: 0 0 clamp(26px, 3.2vw, 38px) clamp(20px, 3vw, 30px);
  border-left: 1px solid var(--about-line);
}

.page-about .era:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .era::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mist);
  transition: background 0.25s var(--ease);
}

.page-about .era--now::before {
  background: var(--flo);
  box-shadow: 0 0 0 4px rgba(55, 245, 212, 0.14);
}

.page-about .era__year {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--flo);
}

.page-about .era__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .era p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队分工 ---------- */
.page-about .crew-layout {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
  align-items: start;
}

.page-about .crew-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .crew-table th,
.page-about .crew-table td {
  text-align: left;
  padding: 14px 12px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}

.page-about .crew-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .crew-table tbody th {
  font-weight: 500;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .crew-num {
  font-size: 20px;
  line-height: 1.2;
  color: var(--flo);
}

.page-about .crew-do {
  color: var(--mist);
  line-height: 1.75;
}

.page-about .crew-table tbody tr {
  transition: background 0.2s var(--ease);
}

.page-about .crew-table tbody tr:hover,
.page-about .crew-table tbody tr:focus-within {
  background: var(--glass);
}

.page-about .crew-table tbody tr:hover .crew-do,
.page-about .crew-table tbody tr:focus-within .crew-do {
  color: var(--paper);
}

.page-about .crew-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--board);
}

.page-about .crew-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .crew-figure figcaption,
.page-about .sync-figure figcaption {
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 更新节点 ---------- */
.page-about .beat-list {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .beat {
  background: var(--ink-2);
  padding: 18px 18px 22px;
}

.page-about .beat__time {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

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

/* ---------- 阵容状态 ---------- */
.page-about .state-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .state-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--board);
  border: 1px solid var(--line-soft);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .state-card:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .state-card__key {
  align-self: flex-start;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--flo);
}

.page-about .state-card--lava .state-card__key {
  background: var(--lava);
  color: var(--paper);
}

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

/* ---------- 同步节奏 ---------- */
.page-about .sync-layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .sync-card {
  background: rgba(11, 31, 25, 0.78);
  border: 1px solid var(--line-soft);
  backdrop-filter: blur(6px);
  transition: border-color 0.2s var(--ease);
}

.page-about .sync-card + .sync-card {
  margin-top: 12px;
}

.page-about .sync-card[open] {
  border-color: var(--line);
}

.page-about .sync-card summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.4;
  color: var(--paper);
}

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

.page-about .sync-card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--flo);
}

.page-about .sync-card[open] summary::after {
  content: "−";
}

.page-about .sync-card summary:focus-visible {
  outline: 2px solid var(--flo);
  outline-offset: -2px;
}

.page-about .sync-card__tag {
  flex: none;
  padding: 2px 9px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--flo);
}

.page-about .sync-card__body {
  padding: 0 18px 20px;
}

.page-about .sync-card__body p {
  margin: 0 0 10px;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .sync-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
  clip-path: polygon(0 3.5%, 100% 0, 100% 96.5%, 0 100%);
}

.page-about .sync-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  background: var(--ink);
}

.page-about .partner__num {
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1;
  color: var(--lava);
  letter-spacing: -0.01em;
}

.page-about .partner__title {
  margin: 0;
  font-size: clamp(16px, 1.5vw, 20px);
  font-weight: 500;
  color: var(--paper);
}

.page-about .partner p {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 下一页入口 ---------- */
.page-about .story-next .chapter-head {
  margin-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .next-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .next-grid > li {
  display: flex;
}

.page-about .next-link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  height: 100%;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-2);
  text-decoration: none;
  transition: background 0.2s var(--ease);
}

.page-about .next-link:hover {
  background: var(--board);
}

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

.page-about .next-link__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--flo);
}

.page-about .next-link__desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--about-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

  .page-about .partner {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }

  .page-about .partner p {
    grid-column: 2;
  }

  .page-about .partner__title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .partner__num {
    grid-row: 1;
  }
}

@media (min-width: 760px) {
  .page-about .chapter-head {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: end;
    column-gap: 20px;
  }

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

@media (min-width: 900px) {
  .page-about .story-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .year-scale {
    display: block;
    position: sticky;
    top: calc(var(--ticker-h) + 28px);
    align-self: start;
    padding-top: 10px;
  }

  .page-about .year-scale__label {
    display: block;
    margin-bottom: 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--mist);
  }

  .page-about .year-scale__list {
    list-style: none;
    margin: 0;
    padding: 0 0 0 14px;
    border-left: 1px solid var(--about-line);
    display: grid;
    gap: 26px;
  }

  .page-about .year-scale__item {
    position: relative;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--mist);
  }

  .page-about .year-scale__item::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 7px;
    width: 9px;
    height: 1px;
    background: currentColor;
  }

  .page-about .year-scale__item.is-now {
    color: var(--flo);
  }

  .page-about .year-scale__item.is-now::before {
    top: 2px;
    left: -15px;
    width: 2px;
    height: 10px;
    background: var(--flo);
  }

  .page-about .crew-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }

  .page-about .sync-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 1100px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-banner img {
    aspect-ratio: 16 / 6.4;
  }
}

@media (max-width: 720px) {
  .page-about .crew-table,
  .page-about .crew-table tbody {
    display: block;
    width: 100%;
  }

  .page-about .crew-table thead {
    display: none;
  }

  .page-about .crew-table tbody tr {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 4px 12px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .crew-table tbody th,
  .page-about .crew-table tbody td {
    display: block;
    padding: 0;
    border: 0;
  }

  .page-about .crew-table tbody th {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .crew-table tbody .crew-num {
    grid-column: 2;
    grid-row: 1;
    text-align: right;
  }

  .page-about .crew-table tbody .crew-do {
    grid-column: 1 / -1;
    grid-row: 2;
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .state-card,
  .page-about .next-link,
  .page-about .crew-table tbody tr,
  .page-about .era::before {
    transition: none;
  }

  .page-about .state-card:hover {
    transform: none;
  }
}