.page-about {
  background: var(--ink-900);
  color: var(--mist-100);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.4vw, 38px) 0 clamp(30px, 4.6vw, 62px);
  background:
    radial-gradient(92% 120% at 92% -8%, var(--cyan-glow) 0%, transparent 62%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-signal {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .about-signal__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 5px var(--cyan-glow);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 0.55; transform: scale(0.86); }
  50% { opacity: 1; transform: scale(1); }
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(1.95rem, 6.2vw, 4.3rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper-050);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist-100);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-stat {
  position: relative;
  padding-top: 13px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.4rem, 3.2vw, 1.9rem);
  line-height: 1.1;
  color: var(--paper-050);
  letter-spacing: 0.02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-300);
}

.page-about .about-stat__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 4;
  width: max-content;
  max-width: min(224px, 66vw);
  padding: 8px 11px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist-100);
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
  border-radius: 10px 2px 10px 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
}

.page-about .about-stats > li:nth-child(even) .about-stat__tip {
  left: auto;
  right: 0;
}

.page-about .about-stat:hover .about-stat__tip,
.page-about .about-stat:focus .about-stat__tip,
.page-about .about-stat:focus-within .about-stat__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-stat:focus {
  outline: none;
}

.page-about .about-stat:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 4px;
}

/* ---------- 左侧章节轴 + 右侧叙事 ---------- */
.page-about .about-body {
  padding: clamp(30px, 4.8vw, 66px) 0 clamp(20px, 3vw, 38px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-axis {
  align-self: start;
}

.page-about .about-axis__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .about-axis__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 14px;
}

.page-about .about-axis__link {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  color: var(--mist-300);
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.4;
  transition: color 0.18s var(--ease);
}

.page-about .about-axis__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 1px;
  background: var(--cyan-400);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.22s var(--ease);
}

.page-about .about-axis__link:hover,
.page-about .about-axis__link:focus-visible {
  color: var(--paper-050);
}

.page-about .about-axis__link:hover::before,
.page-about .about-axis__link:focus-visible::before {
  transform: scaleY(1);
}

.page-about .about-axis__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--signal-500);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(28px, 4vw, 54px);
  padding-top: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .about-sec__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal-500);
  box-shadow: 0 0 0 4px var(--signal-glow);
  flex: none;
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(1.32rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-about .prose {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--mist-100);
}

.page-about .prose p {
  margin: 0 0 1.05em;
}

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

.page-about .prose a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 230, 214, 0.42);
  transition: border-color 0.18s var(--ease);
}

.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

/* ---------- 标签页 ---------- */
.page-about .about-tabs {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 22px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-tabs .tab {
  appearance: none;
  -webkit-appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 10px 0;
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.4;
  color: var(--mist-300);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-tabs .tab:hover {
  color: var(--paper-050);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  color: var(--paper-050);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .about-tabs .tabpanel {
  padding-top: 18px;
}

.page-about .about-tabs .tabpanel[aria-hidden="true"] {
  display: none;
}

.page-about .about-tabs .tabpanel + .tabpanel {
  border-top: 1px solid var(--line-soft);
  margin-top: 16px;
}

.page-about .about-tabs .tabpanel h3 {
  margin: 0 0 10px;
  font-size: 1.04rem;
  color: var(--paper-050);
  letter-spacing: 0.01em;
}

.page-about .about-tabs .tabpanel p {
  max-width: 62ch;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--mist-100);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: var(--radius-soft);
  border: 1px solid var(--line-dark);
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--mist-300);
}

/* ---------- 浅色对照表区 ---------- */
.page-about .about-ledger {
  padding: clamp(32px, 5vw, 70px) 0;
  background: var(--paper-050);
  color: var(--ink-900);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

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

.page-about .about-ledger__kicker {
  margin: 0 0 12px;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-700);
}

.page-about .about-ledger__title {
  margin: 0 0 14px;
  font-size: clamp(1.32rem, 3.2vw, 2rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink-950);
}

.page-about .about-ledger__lede {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--slate-600);
}

.page-about .about-table-wrap {
  margin-top: clamp(22px, 3vw, 34px);
  overflow-x: auto;
}

.page-about .about-table {
  width: 100%;
  min-width: 668px;
  border-collapse: collapse;
}

.page-about .about-table__caption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-about .about-table th {
  text-align: left;
  padding: 0 16px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-600);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-table td {
  padding: 16px;
  vertical-align: top;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--ink-900);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-table th:first-child,
.page-about .about-table td:first-child {
  padding-left: 12px;
}

.page-about .about-table td:first-child {
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(10, 22, 34, 0.035);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: clamp(34px, 5vw, 74px) 0 clamp(36px, 5vw, 78px);
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-timeline__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .about-timeline__title {
  max-width: 26ch;
  margin: 0 0 14px;
  font-size: clamp(1.36rem, 3.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-about .about-timeline__lede {
  max-width: 62ch;
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--mist-100);
}

.page-about .about-timeline__figure {
  margin: clamp(22px, 3.4vw, 38px) 0 clamp(26px, 3.6vw, 44px);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 64px 10px 64px 10px;
  border: 1px solid var(--line-dark);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-timeline__item {
  padding-right: 8px;
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 9px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal-500);
}

.page-about .about-timeline__rail {
  display: block;
  position: relative;
  height: 1px;
  margin-bottom: 15px;
  background: var(--line-dark);
}

.page-about .about-timeline__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px var(--cyan-glow);
  transform: translateY(-50%);
}

.page-about .about-timeline__item:last-child .about-timeline__rail::before {
  background: var(--signal-500);
  box-shadow: 0 0 0 4px var(--signal-glow);
}

.page-about .about-timeline__item-title {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--paper-050);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist-300);
}

/* ---------- 收束区 ---------- */
.page-about .about-outro {
  padding: clamp(32px, 5vw, 74px) 0 clamp(40px, 6vw, 90px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-outro__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-sec--last {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(24px, 3.6vw, 42px);
}

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

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

.page-about .about-outro__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 12px 92px 14px 92px;
  border: 1px solid var(--line-dark);
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-table {
    min-width: 0;
  }
}

@media (max-width: 759px) {
  .page-about .about-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .page-about .about-table,
  .page-about .about-table tbody,
  .page-about .about-table tr,
  .page-about .about-table td {
    display: block;
    width: 100%;
  }

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

  .page-about .about-table tr {
    padding: 16px 0;
    border-bottom: 1px solid var(--line-light);
  }

  .page-about .about-table td {
    padding: 0 14px;
    border: 0;
  }

  .page-about .about-table td + td {
    margin-top: 10px;
  }

  .page-about .about-table td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 4px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--slate-600);
  }

  .page-about .about-table td:first-child {
    padding-left: 14px;
    font-size: 1.02rem;
  }

  .page-about .about-table td:first-child::before {
    content: none;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-timeline__item {
    padding-right: 26px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-axis__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    border-left: 1px solid var(--line-dark);
  }

  .page-about .about-axis__link {
    padding-left: 14px;
  }

  .page-about .about-axis__link::before {
    top: 4px;
    bottom: 4px;
  }
}

@media (min-width: 960px) {
  .page-about .about-outro__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-signal__dot {
    animation: none;
  }

  .page-about [data-reveal],
  .page-about .about-stat__tip,
  .page-about .about-axis__link,
  .page-about .about-axis__link::before {
    transition: none;
  }
}