.page-about {
  background: var(--ink-800);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 44px;
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(61, 242, 206, 0.14), transparent 58%),
    radial-gradient(90% 80% at 100% 8%, rgba(255, 138, 43, 0.1), transparent 55%),
    var(--ink-800);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 22px;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 32px;
  line-height: 1.22;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 记分牌面板 */
.page-about .about-board {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, var(--surface-1), var(--ink-900));
  box-shadow: var(--shadow-card);
}

.page-about .about-board__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-board__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-board__row .stat-value {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  text-align: right;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-board__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(6, 20, 16, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.page-about .about-index__inner {
  display: flex;
  gap: 10px;
  padding-top: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index .chip {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 13px;
  white-space: nowrap;
}

.page-about .about-index .chip.is-active {
  background: var(--surface-2);
  border-color: var(--neon);
  color: var(--neon);
}

/* ---------- 通用跨页布局 ---------- */
.page-about .about-spread__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-main .section-head {
  margin-bottom: 20px;
}

.page-about .about-side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure .media-caption {
  margin-top: 10px;
}

/* ---------- 团队角色卡 ---------- */
.page-about .about-role {
  padding: 22px 20px;
  border-radius: var(--radius-card);
  background: var(--surface-1);
  border: 1px solid var(--line);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--neon);
  background: var(--surface-2);
}

.page-about .about-role .card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .about-role__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--neon);
  color: var(--neon);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-role__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-role__count {
  margin: 0 0 10px;
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-role__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-history__intro {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 26px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl-node {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(170deg, var(--surface-1), var(--ink-900));
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-tl-node:hover,
.page-about .about-tl-node:focus-visible {
  border-color: var(--neon);
  transform: translateY(-4px);
  outline: none;
}

.page-about .about-tl-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 43, 0.16);
  margin-bottom: 14px;
}

.page-about .about-tl-node:nth-child(2) .about-tl-dot {
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(61, 242, 206, 0.16);
}

.page-about .about-tl-node:nth-child(3) .about-tl-dot {
  background: var(--paper);
  box-shadow: 0 0 0 4px rgba(234, 242, 238, 0.14);
}

.page-about .about-tl-era {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-tl-title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: 24px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-tl-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-tl-scale {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--neon);
}

/* ---------- 四个归类维度 ---------- */
.page-about .about-taxonomy__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-taxonomy__visual {
  display: grid;
  justify-items: center;
  gap: 12px;
}

.page-about .about-ring {
  width: min(100%, 320px);
  height: auto;
  filter: drop-shadow(0 0 24px rgba(61, 242, 206, 0.18));
}

.page-about .about-taxonomy__cap {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-dims {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
}

.page-about .about-dim {
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  background: var(--surface-1);
}

.page-about .about-dim:nth-child(2) {
  border-left-color: var(--paper);
}

.page-about .about-dim:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .about-dim:nth-child(4) {
  border-left-color: var(--muted);
}

.page-about .about-dim__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-dim__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 改版对照 ---------- */
.page-about .about-revision__intro {
  margin: 14px 0 0;
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-compare {
  display: grid;
  gap: 20px;
  margin-top: 34px;
}

.page-about .about-wire {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--ink-900);
}

.page-about .about-wire--after {
  border-color: rgba(61, 242, 206, 0.45);
  background: linear-gradient(165deg, var(--surface-1), var(--ink-900));
}

.page-about .about-wire__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-wire--after .about-wire__label {
  color: var(--neon);
}

.page-about .about-wire__stack {
  display: grid;
  gap: 10px;
}

.page-about .about-wire__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .about-wire__col {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--line);
}

.page-about .about-wire__bar {
  display: block;
  height: 14px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
}

.page-about .about-wire__bar--tall {
  height: 52px;
  border-radius: var(--radius-sm);
}

.page-about .about-wire__bar--short {
  width: 58%;
}

.page-about .about-wire__bar--neon {
  background: rgba(61, 242, 206, 0.55);
}

.page-about .about-wire__bar--orange {
  background: rgba(255, 138, 43, 0.6);
}

.page-about .about-wire__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-effect {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-effect__item {
  padding: 18px;
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  border: 1px solid var(--line);
}

.page-about .about-effect__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-effect__value {
  margin: 0;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-panel {
  padding: 22px 20px;
  border-radius: var(--radius-card);
  background: var(--surface-1);
  border: 1px solid var(--line);
}

.page-about .about-partner-panel__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .about-partner-panel__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partner-panel__row .stat-value {
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  text-align: right;
  color: var(--paper);
}

.page-about .about-watch {
  padding: 22px 20px;
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, var(--surface-2), var(--surface-1));
  border: 1px solid var(--line);
}

.page-about .about-watch__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .about-watch__link {
  display: inline-flex;
}

/* ---------- 更新节拍 ---------- */
.page-about .about-rhythm__intro {
  margin: 14px 0 0;
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-rhythm__lines {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-line {
  padding: 22px 20px;
  border-radius: var(--radius-card);
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line);
  transition: border-color 200ms var(--ease);
}

.page-about .about-line:hover {
  border-color: var(--neon);
  border-top-color: var(--orange);
}

.page-about .about-line__time {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-line__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-line__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: 40px;
  padding: 26px 22px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(61, 242, 206, 0.14), transparent 60%),
    linear-gradient(150deg, var(--surface-1), var(--ink-900));
  border: 1px solid var(--line);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__sub {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-effect {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-dim {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
    align-items: start;
  }

  .page-about .about-dim__name {
    margin: 0;
  }

  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 30px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 64px;
  }

  .page-about .about-hero h1 {
    font-size: 52px;
    max-width: 20ch;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: start;
    margin-top: 30px;
  }

  .page-about .about-index {
    top: 0;
  }

  .page-about .about-spread__grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-spread__grid--flip {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .about-spread__grid--flip .about-side {
    order: -1;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    padding-top: 34px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 8px;
    right: 8px;
    top: 12px;
    height: 1px;
    background: linear-gradient(90deg, var(--line), var(--neon) 45%, var(--orange) 100%);
  }

  .page-about .about-tl-dot {
    position: absolute;
    top: -34px;
    left: 20px;
    margin-bottom: 0;
  }

  .page-about .about-taxonomy__grid {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-compare {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .page-about .about-rhythm__lines {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-role__count {
    font-size: 40px;
  }
}