.page-about {
  --ab-accent: var(--neon-purple);
  --ab-blue: var(--neon-blue);
  --ab-green: var(--neon-green);
  --ab-line-soft: rgba(139, 92, 246, 0.16);
  --ab-shadow: 0 18px 46px rgba(2, 6, 18, 0.5);
  position: relative;
  isolation: isolate;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 12% 14%, rgba(139, 92, 246, 0.12) 0, transparent 34%),
    radial-gradient(circle at 86% 48%, rgba(0, 212, 255, 0.08) 0, transparent 36%),
    radial-gradient(circle at 28% 86%, rgba(57, 255, 20, 0.05) 0, transparent 26%),
    linear-gradient(rgba(31, 42, 68, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 42, 68, 0.55) 1px, transparent 1px);
  background-size: auto, auto, auto, 46px 46px, 46px 46px;
  pointer-events: none;
}

.page-about::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(10, 14, 23, 0.9) 0%, rgba(10, 14, 23, 0.78) 50%, rgba(10, 14, 23, 0.92) 100%);
  pointer-events: none;
}

.page-about .breadcrumb {
  margin: 28px 0 0;
}

.page-about .breadcrumb__list {
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.page-about .breadcrumb__item a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.25s ease;
}

.page-about .breadcrumb__item a:hover {
  color: var(--neon-blue);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--neon-purple);
}

.page-about .about-hero {
  position: relative;
  margin-top: 20px;
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(139, 92, 246, 0.14), transparent 42%),
    linear-gradient(315deg, rgba(0, 212, 255, 0.1), transparent 50%),
    var(--bg-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .page-header__kicker {
  position: relative;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-blue);
  padding-left: 18px;
  margin: 0 0 14px;
}

.page-about .page-header__kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 1px;
  background: var(--neon-blue);
  box-shadow: 0 0 8px var(--neon-blue);
}

.page-about .page-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--text-main);
  margin: 0 0 16px;
  text-shadow: 0 0 30px rgba(139, 92, 246, 0.25);
}

.page-about .page-header__intro {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 66ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 28px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
  gap: 1px;
}

.page-about .about-hero__stat {
  background: rgba(10, 14, 23, 0.92);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: background 0.3s ease;
}

.page-about .about-hero__stat:hover {
  background: rgba(18, 24, 43, 0.95);
}

.page-about .about-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-hero__stat dd {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--neon-blue);
  text-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
  margin: 0;
}

.page-about .section-block + .section-block {
  margin-top: clamp(72px, 10vw, 120px);
}

.page-about .section-block__header {
  margin-bottom: 34px;
}

.page-about .section-block__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--neon-green);
  letter-spacing: 0.12em;
  border: 1px solid rgba(57, 255, 20, 0.3);
  padding: 4px 8px;
  margin-bottom: 12px;
}

.page-about .section-block__title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-main);
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.page-about .section-block__sub {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  margin: 0;
}

.page-about .about-origin__body {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__copy p {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0 0 1em;
}

.page-about .about-origin__media {
  margin: 0;
  position: relative;
}

.page-about .about-origin__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-origin__media figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 12px;
  line-height: 1.5;
  padding-left: 12px;
  border-left: 2px solid var(--neon-purple);
}

.page-about .about-milestones__timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-milestones__timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--line), rgba(139, 92, 246, 0.7), var(--line));
}

.page-about .about-milestones__item {
  position: relative;
  padding-left: 40px;
}

.page-about .about-milestones__marker {
  position: absolute;
  left: 0;
  top: 14px;
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-milestones__dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-purple);
  box-shadow: 0 0 12px var(--neon-purple), 0 0 5px var(--neon-blue);
  outline: 3px solid rgba(139, 92, 246, 0.18);
  transition: box-shadow 0.3s ease;
}

.page-about .about-milestones__item:hover .about-milestones__dot {
  box-shadow: 0 0 20px var(--neon-purple), 0 0 10px var(--neon-blue), 0 0 2px var(--neon-blue);
}

.page-about .about-milestones__card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 20px 22px;
  position: relative;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-milestones__card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: linear-gradient(180deg, var(--neon-purple), var(--neon-blue));
  border-radius: 0 2px 2px 0;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.page-about .about-milestones__item:hover .about-milestones__card {
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.12);
}

.page-about .about-milestones__version {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--neon-purple);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.page-about .about-milestones__card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.page-about .about-milestones__card p {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-dim);
  margin: 0;
}

.page-about .about-data__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-data__main h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--neon-blue);
  margin: 0 0 8px;
  padding-left: 14px;
  position: relative;
}

.page-about .about-data__main h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--neon-blue);
  box-shadow: 0 0 8px var(--neon-blue);
}

.page-about .about-data__main h3 + p {
  margin-top: 0;
}

.page-about .about-data__main p {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
  margin: 0 0 22px;
}

.page-about .about-data__figure {
  margin: 0;
  position: relative;
}

.page-about .about-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-data__figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--neon-blue);
  line-height: 1.5;
}

.page-about .about-data__panel {
  margin-top: 34px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
}

.page-about .console-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-main);
  background: rgba(13, 19, 34, 0.8);
}

.page-about .about-data__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-data__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
  transition: background 0.3s ease;
}

.page-about .about-data__step:last-child {
  border-bottom: 0;
}

.page-about .about-data__step:hover {
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.1), transparent);
}

.page-about .about-data__step dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--neon-purple);
  position: relative;
  padding-left: 14px;
}

.page-about .about-data__step dt::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--neon-blue);
  transform: translateY(-50%);
}

.page-about .about-data__step dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.page-about .about-hunan__body {
  display: grid;
  gap: 28px;
}

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

.page-about .about-hunan__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-hunan__media figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--neon-green);
  line-height: 1.5;
}

.page-about .about-hunan__info > p {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
  margin: 0 0 18px;
}

.page-about .about-hunan__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--bg-card);
}

.page-about .about-hunan__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.page-about .about-hunan__list li:last-child {
  border-bottom: 0;
}

.page-about .about-hunan__list li > span:first-child {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--neon-blue);
  min-width: 5.2em;
}

.page-about .about-hunan__list li > span:last-child {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-main);
  line-height: 1.6;
}

.page-about .about-hunan__note {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-top: 12px;
  line-height: 1.6;
}

.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(64px, 10vw, 110px);
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.page-about .about-links__card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 14px;
  row-gap: 4px;
  align-items: center;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon-purple);
  color: var(--text-main);
  text-decoration: none;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-links__card:hover {
  transform: translateX(6px);
  border-color: var(--neon-purple);
  background: var(--bg-panel);
}

.page-about .about-links__num {
  grid-row: 1 / 3;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--neon-blue);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
}

.page-about .about-links__card strong {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.page-about .about-links__card span:last-child {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.5;
}

@media (min-width: 860px) {
  .page-about .about-origin__body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-milestones__timeline {
    gap: 20px;
  }

  .page-about .about-milestones__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-milestones__item {
    display: grid;
    grid-template-columns: 1fr 44px 1fr;
    column-gap: 28px;
    padding-left: 0;
    min-height: 150px;
    align-items: center;
  }

  .page-about .about-milestones__marker {
    position: static;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    align-self: center;
  }

  .page-about .about-milestones__item:nth-child(odd) .about-milestones__card {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .page-about .about-milestones__item:nth-child(odd) .about-milestones__card::after {
    left: auto;
    right: 0;
  }

  .page-about .about-milestones__item:nth-child(even) .about-milestones__card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .about-data__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hunan__body {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }

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

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