.page-about {
  --about-rail-width: 240px;
  --about-glow: rgba(255, 90, 60, 0.18);
  background: var(--ml-night);
  color: var(--ml-net);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 108px 0 48px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(91, 214, 196, 0.12), transparent 62%),
    linear-gradient(168deg, var(--ml-pitch) 0%, var(--ml-night) 68%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(243, 247, 242, 0.06) 1px, transparent 1px),
    linear-gradient(0deg, rgba(243, 247, 242, 0.05) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(120% 80% at 20% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 80% at 20% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -52%;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, var(--about-glow), transparent 68%);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  margin: 20px 0 14px;
  color: var(--ml-amber);
  transform: skewX(-6deg);
  transform-origin: left center;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20em;
  font-family: var(--ml-font-display);
  font-size: clamp(30px, 6.4vw, 56px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ml-net);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  color: var(--ml-mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-hero__stat {
  padding: 16px 18px;
  border: 1px solid var(--ml-line);
  border-radius: var(--ml-radius-md);
  background: rgba(14, 59, 48, 0.62);
}

.page-about .about-hero__stat-label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ml-mist);
}

.page-about .about-hero__stat-value {
  margin: 0;
  font-family: var(--ml-font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--ml-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stat-value span {
  font-size: 13px;
  font-weight: 500;
  margin-left: 3px;
  color: var(--ml-mist);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 8px;
  padding-bottom: 72px;
}

/* ---------- 左侧宣言栏 ---------- */
.page-about .about-rail {
  padding: 22px 20px;
  border: 1px solid var(--ml-line);
  border-left: 3px solid var(--ml-signal);
  border-radius: var(--ml-radius-lg);
  background: linear-gradient(150deg, rgba(16, 66, 54, 0.9), rgba(7, 31, 26, 0.9));
}

.page-about .about-rail__mark {
  margin: 0;
  font-family: var(--ml-font-display);
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  color: var(--ml-net);
  transform: skewX(-8deg);
  transform-origin: left center;
}

.page-about .about-rail__since {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--ml-amber);
  letter-spacing: 0.04em;
}

.page-about .about-rail__since .ml-num {
  font-family: var(--ml-font-mono);
  font-size: 15px;
  font-weight: 700;
}

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

.page-about .about-rail__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-about .about-rail__link {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--ml-line);
  border-radius: var(--ml-pill);
  font-size: 13px;
  color: var(--ml-mist);
  text-decoration: none;
  transition: color 0.14s var(--ml-ease), border-color 0.14s var(--ml-ease),
    background-color 0.14s var(--ml-ease);
}

.page-about .about-rail__link:hover {
  color: var(--ml-ink);
  background: var(--ml-amber);
  border-color: var(--ml-amber);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--ml-amber);
  outline-offset: 2px;
  color: var(--ml-ink);
  background: var(--ml-amber);
  border-color: var(--ml-amber);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-top: 44px;
  margin-top: 52px;
  scroll-margin-top: 96px;
}

.page-about .about-chapter:first-child {
  margin-top: 0;
  padding-top: 8px;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(185, 196, 190, 0.42) 0 16px,
    transparent 16px 30px
  );
}

.page-about .about-chapter:first-child::before {
  display: none;
}

.page-about .about-chapter__index {
  margin: 0 0 10px;
  font-family: var(--ml-font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ml-signal);
}

.page-about .about-chapter .ml-section-title {
  margin: 0 0 20px;
  max-width: 22em;
  font-family: var(--ml-font-display);
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--ml-net);
}

.page-about .about-chapter__lede {
  margin-top: -6px;
}

.page-about .about-chapter .ml-prose {
  margin: 0 0 16px;
  max-width: 38em;
  color: var(--ml-mist);
  line-height: 1.8;
}

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

.page-about .about-chapter .ml-prose a,
.page-about .about-coverage__link a {
  color: var(--ml-track);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-chapter .ml-prose a:hover,
.page-about .about-coverage__link a:hover {
  color: var(--ml-amber);
}

.page-about .about-chapter .ml-prose a:focus-visible,
.page-about .about-coverage__link a:focus-visible {
  outline: 2px solid var(--ml-amber);
  outline-offset: 2px;
  border-radius: 4px;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--ml-radius-lg);
  overflow: hidden;
  border: 1px solid var(--ml-line);
  background: var(--ml-concrete);
}

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

.page-about .about-figure--tunnel img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure .ml-media__caption {
  padding: 10px 16px 12px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ml-mist);
  background: rgba(43, 50, 52, 0.9);
}

.page-about .about-figure--desk {
  margin-top: 28px;
}

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

/* ---------- 编辑台展签卡 ---------- */
.page-about .about-desk {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 8px;
}

.page-about .about-desk__card {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--ml-line);
  border-radius: var(--ml-radius-lg);
  background: linear-gradient(158deg, rgba(16, 66, 54, 0.92), rgba(7, 31, 26, 0.96));
  transition: transform 0.16s var(--ml-ease), border-color 0.16s var(--ml-ease),
    box-shadow 0.16s var(--ml-ease);
}

.page-about .about-desk__card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  border-top: 2px solid var(--ml-amber);
  border-right: 2px solid var(--ml-amber);
  border-top-right-radius: var(--ml-radius-lg);
  opacity: 0.7;
  transition: opacity 0.16s var(--ml-ease);
}

.page-about .about-desk__card:hover,
.page-about .about-desk__card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(255, 194, 75, 0.7);
  box-shadow: var(--ml-shadow);
}

.page-about .about-desk__card:hover::before,
.page-about .about-desk__card:focus-within::before {
  opacity: 1;
}

.page-about .about-desk__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border-radius: var(--ml-pill);
  font-family: var(--ml-font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--ml-ink);
  background: var(--ml-amber);
}

.page-about .about-desk__title {
  margin: 0 0 8px;
  font-family: var(--ml-font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ml-net);
}

.page-about .about-desk__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ml-mist);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 24px;
}

.page-about .about-coverage__stat {
  padding: 16px 18px;
  border-left: 3px solid var(--ml-track);
  border-radius: 0 var(--ml-radius-md) var(--ml-radius-md) 0;
  background: rgba(43, 50, 52, 0.55);
}

.page-about .about-coverage__num {
  display: block;
  font-family: var(--ml-font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ml-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-coverage__num span {
  font-size: 13px;
  font-weight: 500;
  margin-left: 4px;
  color: var(--ml-mist);
}

.page-about .about-coverage__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ml-mist);
}

.page-about .about-table-wrap {
  margin: 26px 0 18px;
  border: 1px solid var(--ml-line);
  border-radius: var(--ml-radius-md);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table__caption {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ml-mist);
  background: var(--ml-concrete);
  border-bottom: 1px solid var(--ml-line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  color: var(--ml-net);
  border-bottom: 1px solid var(--ml-line);
  line-height: 1.65;
}

.page-about .about-table thead th {
  font-family: var(--ml-font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--ml-amber);
  background: rgba(14, 59, 48, 0.86);
  white-space: nowrap;
}

.page-about .about-table tbody th {
  font-weight: 700;
  white-space: nowrap;
  color: var(--ml-net);
}

.page-about .about-table tbody td {
  color: var(--ml-mist);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover th,
.page-about .about-table tbody tr:hover td {
  background: rgba(91, 214, 196, 0.06);
}

.page-about .about-coverage__link {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ml-mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--ml-amber) 0%, rgba(255, 194, 75, 0.14) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 4px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--ml-amber);
  box-shadow: 0 0 0 4px var(--ml-night);
  transition: transform 0.16s var(--ml-ease), background-color 0.16s var(--ml-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: scale(1.18);
  background: var(--ml-signal);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--ml-font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ml-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__year span {
  display: inline-block;
  margin-left: 6px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ml-mist);
}

.page-about .about-timeline__title {
  margin: 8px 0 6px;
  font-family: var(--ml-font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ml-net);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ml-mist);
}

.page-about .about-timeline__impact {
  margin: 10px 0 0;
  padding: 8px 12px;
  border-left: 2px solid var(--ml-track);
  border-radius: 0 10px 10px 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ml-net);
  background: rgba(91, 214, 196, 0.08);
  transition: background-color 0.16s var(--ml-ease), border-color 0.16s var(--ml-ease);
}

.page-about .about-timeline__item:hover .about-timeline__impact,
.page-about .about-timeline__item:focus-within .about-timeline__impact {
  background: rgba(255, 194, 75, 0.12);
  border-color: var(--ml-amber);
}

/* ---------- 看台反馈 ---------- */
.page-about .about-quote {
  position: relative;
  margin: 26px 0;
  padding: 30px 22px 22px;
  border-radius: var(--ml-radius-xl);
  background: var(--ml-paper);
  color: var(--ml-ink);
}

.page-about .about-quote::before {
  content: "\201C";
  position: absolute;
  top: 4px;
  left: 16px;
  font-family: var(--ml-font-display);
  font-size: 62px;
  line-height: 1;
  color: var(--ml-signal);
  opacity: 0.85;
}

.page-about .about-quote__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  font-weight: 500;
  color: var(--ml-ink);
}

.page-about .about-quote__source {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(16, 22, 20, 0.16);
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(16, 22, 20, 0.72);
}

/* ---------- 收尾 ---------- */
.page-about .about-chapter--last .ml-prose {
  max-width: 36em;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 380px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__stat-value {
    font-size: 26px;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 128px 0 60px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    max-width: 760px;
  }

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

  .page-about .about-coverage__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-quote {
    padding: 34px 32px 24px;
  }

  .page-about .about-quote__text {
    font-size: 18px;
  }
}

/* ---------- 桌面：左栏常驻 ---------- */
@media (min-width: 920px) {
  .page-about .about-hero {
    padding: 148px 0 72px;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(220px, 3.4fr) minmax(0, 8.6fr);
    gap: 56px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    padding: 26px 22px;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-top: 22px;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 6px 0 6px 12px;
    border: 0;
    border-left: 2px solid var(--ml-line);
    border-radius: 0;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--ml-amber);
    background: none;
    color: var(--ml-amber);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-chapter {
    padding-top: 52px;
    margin-top: 64px;
  }

  .page-about .about-timeline__year {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-desk__card,
  .page-about .about-desk__card::before,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__impact,
  .page-about .about-rail__link {
    transition: none;
  }

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

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