.page-about {
  background: var(--dx-fog);
  color: var(--dx-ink);
  font-family: var(--dx-font-body);
  overflow-x: clip;
  padding-bottom: var(--dx-s6);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--dx-s4) 0 var(--dx-s5);
  border-bottom: 1px solid var(--dx-line-strong);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -4%;
  width: min(300px, 58vw);
  height: min(300px, 58vw);
  background:
    radial-gradient(circle at 34% 34%, rgba(45, 107, 255, 0.20), rgba(45, 107, 255, 0) 64%),
    radial-gradient(circle at 68% 66%, rgba(34, 211, 182, 0.22), rgba(34, 211, 182, 0) 62%);
  border-radius: 52% 48% 40% 60% / 46% 56% 44% 54%;
  transform: rotate(-7deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__head {
  position: relative;
  z-index: 1;
  max-width: 44em;
}

.page-about .about-hero__head .dx-eyebrow {
  margin: 0 0 var(--dx-s2);
  letter-spacing: 0.16em;
  color: var(--dx-blue);
}

.page-about .about-hero__head .dx-h1 {
  margin: 0 0 var(--dx-s3);
  max-width: 20em;
  line-height: 1.16;
}

.page-about .about-hero__head .dx-lede {
  margin: 0;
  max-width: 42em;
  color: var(--dx-text-soft);
  line-height: 1.85;
}

.page-about .about-hero__tags {
  list-style: none;
  margin: var(--dx-s4) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__tags li {
  font-family: var(--dx-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border-radius: 999px;
  color: var(--dx-ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--dx-line);
  position: relative;
}

.page-about .about-hero__tags li::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--dx-blue);
  vertical-align: 1px;
}

.page-about .about-hero__tags li:nth-child(2)::before { background: var(--dx-teal); }
.page-about .about-hero__tags li:nth-child(3)::before { background: var(--dx-amber); }
.page-about .about-hero__tags li:nth-child(4)::before { background: var(--dx-violet); }

/* ---------- 侧栏索引 + 主体 ---------- */
.page-about .about-layout {
  padding-top: var(--dx-s4);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--dx-s3);
}

.page-about .about-index {
  border-top: 2px solid var(--dx-ink);
  padding-top: var(--dx-s2);
}

.page-about .about-index__label {
  margin: 0 0 var(--dx-s2);
  font-family: var(--dx-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--dx-steel);
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index li {
  flex: 0 0 auto;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 14px;
  font-size: 13.5px;
  color: var(--dx-text-soft);
  text-decoration: none;
  border: 1px solid var(--dx-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  transition: color 0.2s var(--dx-ease), border-color 0.2s var(--dx-ease), background 0.2s var(--dx-ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--dx-ink);
  border-color: rgba(45, 107, 255, 0.55);
  background: rgba(45, 107, 255, 0.08);
  outline: none;
}

.page-about .about-index__num {
  font-family: var(--dx-font-mono);
  font-size: 11px;
  color: var(--dx-blue);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding: var(--dx-s5) 0;
  border-top: 1px solid var(--dx-line);
  scroll-margin-top: 96px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--dx-s2);
  margin-bottom: var(--dx-s3);
}

.page-about .chapter-num {
  flex: none;
  font-family: var(--dx-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dx-blue);
  background: rgba(45, 107, 255, 0.08);
  border: 1px solid rgba(45, 107, 255, 0.3);
  border-radius: 999px;
  padding: 3px 10px;
  transition: background 0.25s var(--dx-ease), color 0.25s var(--dx-ease);
}

.page-about .chapter-head h2 {
  margin: 0;
  flex: 1 1 12em;
  min-width: 0;
}

.page-about .chapter-note {
  margin-left: auto;
  font-family: var(--dx-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--dx-steel);
  white-space: nowrap;
}

.page-about .about-chapter:target .chapter-num {
  background: var(--dx-blue);
  color: var(--dx-fog);
  border-color: var(--dx-blue);
}

.page-about .about-chapter p {
  margin: 0 0 var(--dx-s2);
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--dx-text-soft);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: var(--dx-s4) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--dx-radius);
  border: 1px solid var(--dx-line);
  background: var(--dx-ink);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dx-steel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--dx-blue), var(--dx-teal) 55%, var(--dx-amber));
  opacity: 0.5;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 var(--dx-s4) 36px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--dx-fog);
  border: 2px solid var(--dx-blue);
  box-shadow: 0 0 0 4px rgba(45, 107, 255, 0.1);
}

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

.page-about .about-tl__year {
  display: block;
  font-family: var(--dx-font-mono);
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--dx-ink);
  margin-bottom: 6px;
}

.page-about .about-tl__body h3 {
  margin: 0 0 6px;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dx-text-soft);
  max-width: 40em;
}

/* ---------- 节奏列表 ---------- */
.page-about .about-rows {
  list-style: none;
  margin: var(--dx-s3) 0;
  padding: 0;
  border-top: 1px solid var(--dx-line);
}

.page-about .about-rows__item {
  display: grid;
  gap: 4px;
  padding: var(--dx-s2) 0;
  border-bottom: 1px solid var(--dx-line);
}

.page-about .about-rows__key {
  font-family: var(--dx-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--dx-blue);
}

.page-about .about-rows__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dx-text-soft);
}

/* ---------- 终端标签 ---------- */
.page-about .about-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: var(--dx-s3) 0;
  padding: 0;
}

.page-about .about-chips li {
  font-family: var(--dx-font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px dashed var(--dx-line-strong);
  background: rgba(255, 255, 255, 0.56);
  color: var(--dx-text-soft);
}

.page-about .about-chips li:last-child {
  border-style: solid;
  border-color: rgba(124, 92, 255, 0.45);
  color: var(--dx-violet);
  background: rgba(124, 92, 255, 0.07);
}

/* ---------- 数字标签 ---------- */
.page-about .about-stats {
  display: grid;
  gap: var(--dx-s2);
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-bottom: var(--dx-s3);
}

.page-about .about-stat {
  --stat-accent: var(--dx-blue);
  position: relative;
  padding: var(--dx-s3);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--dx-line);
  border-radius: var(--dx-radius);
  overflow: hidden;
  transition: border-color 0.25s var(--dx-ease), box-shadow 0.25s var(--dx-ease), transform 0.25s var(--dx-ease);
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--stat-accent);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-within {
  border-color: var(--stat-accent);
  box-shadow: 0 18px 36px -30px rgba(11, 15, 20, 0.8);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-stat--teal { --stat-accent: var(--dx-teal); }
.page-about .about-stat--violet { --stat-accent: var(--dx-violet); }
.page-about .about-stat--amber { --stat-accent: var(--dx-amber); }

.page-about .about-stat__num {
  font-family: var(--dx-font-mono);
  font-size: 32px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--dx-ink);
}

.page-about .about-stat__num--range {
  font-size: 19px;
  letter-spacing: 0;
}

.page-about .about-stat__unit {
  font-family: var(--dx-font-mono);
  font-size: 13px;
  color: var(--dx-steel);
  margin-left: 3px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--dx-ink);
}

.page-about .about-stat__hint {
  display: block;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--dx-line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--dx-steel);
  transition: color 0.2s var(--dx-ease);
}

.page-about .about-stat:hover .about-stat__hint,
.page-about .about-stat:focus-within .about-stat__hint {
  color: var(--stat-accent);
}

/* ---------- 底部入口 ---------- */
.page-about .about-links {
  display: grid;
  gap: var(--dx-s2);
  margin-top: var(--dx-s5);
  padding-top: var(--dx-s4);
  border-top: 2px solid var(--dx-ink);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-link {
  display: grid;
  gap: 6px;
  padding: var(--dx-s3);
  border: 1px solid var(--dx-line);
  border-radius: var(--dx-radius);
  background: rgba(255, 255, 255, 0.66);
  color: var(--dx-ink);
  text-decoration: none;
  transition: transform 0.25s var(--dx-ease), border-color 0.25s var(--dx-ease), box-shadow 0.25s var(--dx-ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(45, 107, 255, 0.5);
  box-shadow: 0 20px 40px -32px rgba(11, 15, 20, 0.85);
  outline: none;
}

.page-about .about-link__k {
  font-family: var(--dx-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dx-steel);
}

.page-about .about-link__t {
  font-family: var(--dx-font-title);
  font-size: 17px;
  font-weight: 700;
  color: var(--dx-ink);
}

.page-about .about-link__d {
  font-size: 13px;
  line-height: 1.7;
  color: var(--dx-text-soft);
}

.page-about .about-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--dx-s4);
  font-family: var(--dx-font-mono);
  font-size: 12.5px;
  color: var(--dx-steel);
  text-decoration: none;
  border-bottom: 1px solid var(--dx-line-strong);
  padding-bottom: 3px;
  transition: color 0.2s var(--dx-ease), border-color 0.2s var(--dx-ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--dx-blue);
  border-color: var(--dx-blue);
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-rows__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: var(--dx-s3);
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: var(--dx-s5);
    padding-bottom: var(--dx-s6);
  }

  .page-about .about-hero__head .dx-h1 {
    max-width: 16em;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: var(--dx-s6);
    align-items: start;
    padding-top: var(--dx-s5);
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    border-top-width: 3px;
  }

  .page-about .about-index ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index li {
    flex: 1 1 auto;
  }

  .page-about .about-index a {
    display: flex;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 8px 8px 0;
    padding: 7px 10px;
    background: transparent;
    white-space: normal;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: rgba(45, 107, 255, 0.07);
    border-left-color: var(--dx-blue);
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: var(--dx-s3);
    padding-left: 40px;
    padding-bottom: var(--dx-s5);
  }

  .page-about .about-tl__year {
    font-size: 26px;
    margin-bottom: 0;
    padding-top: 2px;
  }

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

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

@media (max-width: 600px) {
  .page-about .chapter-note {
    display: none;
  }

  .page-about .about-stat__num {
    font-size: 27px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }

  .page-about .about-stat:hover,
  .page-about .about-link:hover {
    transform: none;
  }
}