.page-about {
  --about-accent: #00FF88;
  --about-muted-line: rgba(192, 192, 192, 0.16);
  --about-index-line: rgba(255, 255, 255, 0.1);
  position: relative;
  overflow-x: clip;
  color: var(--color-text);
  background-color: var(--color-bg);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 48px;
  border-bottom: 1px solid var(--about-muted-line);
  background:
    linear-gradient(135deg, rgba(42, 27, 61, 0.7) 0%, transparent 45%),
    linear-gradient(45deg, transparent 62%, rgba(138, 43, 226, 0.2) 100%),
    var(--color-bg-deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 255, 136, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(0, 255, 136, 0.12), transparent 65%);
  pointer-events: none;
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: 24px;
  margin-top: 40px;
}

.page-about .about-hero__content {
  max-width: 780px;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-green);
  text-transform: uppercase;
}

.page-about .about-hero__kicker .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px var(--color-green);
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

.page-about .about-hero__title span {
  display: block;
  margin-top: 8px;
  max-width: 17em;
  color: var(--color-text);
  font-size: 0.6em;
  font-weight: 400;
  letter-spacing: 0.14em;
}

.page-about .about-hero__desc {
  max-width: 680px;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-muted);
}

.page-about .about-hero__mark {
  display: none;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-muted-line);
}

.page-about .about-hero__stat {
  padding: 18px 16px;
  border-right: 1px solid var(--about-muted-line);
  border-bottom: 1px solid var(--about-muted-line);
  background: rgba(22, 22, 34, 0.7);
}

.page-about .about-hero__stat:nth-child(2n) {
  border-right: 0;
}

.page-about .about-hero__stat:nth-child(n+3) {
  border-bottom: 0;
}

.page-about .about-hero__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-green);
}

.page-about .about-hero__stat-label {
  font-size: 0.78rem;
  color: var(--color-muted);
}

.page-about .about-chapters {
  position: relative;
  padding: 56px 0 48px;
}

.page-about .about-chapters__lead {
  position: relative;
  max-width: 640px;
  padding: 8px 0 40px;
}

.page-about .about-chapters__lead-index {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  -webkit-text-stroke: 1px var(--color-green);
}

.page-about .about-chapters__lead-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  color: var(--color-white);
}

.page-about .about-chapters__lead p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .timeline-chapter {
  --chapter-accent: var(--color-green);
  position: relative;
  padding: 48px 0 56px 52px;
  border-top: 1px solid var(--about-muted-line);
}

.page-about .timeline-chapter--origin {
  --chapter-accent: var(--color-red);
  background: radial-gradient(ellipse at 10% 30%, rgba(255, 56, 96, 0.06), transparent 50%);
}

.page-about .timeline-chapter--redesign {
  --chapter-accent: var(--color-green);
  background: radial-gradient(ellipse at 10% 30%, rgba(0, 255, 136, 0.06), transparent 50%);
}

.page-about .timeline-chapter--wiki {
  --chapter-accent: var(--color-purple);
  background: radial-gradient(ellipse at 10% 30%, rgba(138, 43, 226, 0.08), transparent 50%);
}

.page-about .timeline-chapter--future {
  --chapter-accent: var(--color-metal);
  background: radial-gradient(ellipse at 10% 30%, rgba(192, 192, 192, 0.06), transparent 50%);
}

.page-about .timeline-chapter::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--chapter-accent), transparent 85%);
  opacity: 0.4;
}

.page-about .timeline-chapter::after {
  content: "";
  position: absolute;
  left: 0;
  top: 56px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--chapter-accent);
  box-shadow: 0 0 14px var(--chapter-accent), 0 0 0 4px rgba(42, 27, 61, 0.9);
}

.page-about .timeline-chapter__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin-bottom: 14px;
  border-top: 2px solid var(--chapter-accent);
  padding-top: 10px;
}

.page-about .timeline-chapter__period {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--chapter-accent);
}

.page-about .timeline-chapter__label {
  padding: 2px 8px;
  font-size: 0.75rem;
  color: var(--color-muted);
  border: 1px solid var(--about-muted-line);
  border-radius: var(--radius-pill);
}

.page-about .timeline-chapter__body {
  position: relative;
}

.page-about .timeline-chapter__index {
  position: absolute;
  top: -18px;
  right: -4px;
  z-index: 0;
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 12vw, 10rem);
  font-weight: 800;
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  -webkit-text-stroke: 1px var(--about-index-line);
  pointer-events: none;
  user-select: none;
}

.page-about .timeline-chapter__body h3 {
  position: relative;
  z-index: 1;
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.8rem);
  line-height: 1.3;
  color: var(--color-white);
}

.page-about .timeline-chapter__body p {
  position: relative;
  z-index: 1;
  margin: 0 0 16px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--color-text);
}

.page-about .timeline-chapter__figure {
  position: relative;
  z-index: 1;
  margin: 28px 0;
}

.page-about .timeline-chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-muted-line);
  border-radius: var(--radius-md);
}

.page-about .timeline-chapter__figure figcaption {
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--color-muted);
}

.page-about .timeline-chapter__details {
  position: relative;
  z-index: 1;
  margin-top: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 255, 136, 0.2);
  border-radius: var(--radius-md);
  background: rgba(0, 255, 136, 0.04);
}

.page-about .timeline-chapter__details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-white);
  transition: background var(--transition-fast);
}

.page-about .timeline-chapter__details summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-chapter__details summary:hover {
  background: rgba(0, 255, 136, 0.06);
}

.page-about .timeline-chapter__details summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-green);
  transition: transform var(--transition-fast);
}

.page-about .timeline-chapter__details[open] summary::after {
  transform: rotate(45deg);
}

.page-about .timeline-chapter__details ul {
  margin: 0;
  padding: 4px 16px 16px 36px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about .timeline-chapter__details li + li {
  margin-top: 4px;
}

.page-about .timeline-chapter__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  position: relative;
  z-index: 1;
  margin: 20px 0;
}

.page-about .timeline-chapter__stat {
  padding: 14px 8px;
  text-align: center;
  border: 1px solid var(--about-muted-line);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
}

.page-about .timeline-chapter__stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-white);
  margin-bottom: 6px;
}

.page-about .timeline-chapter__stat span {
  font-size: 0.72rem;
  color: var(--color-muted);
}

.page-about .about-principles {
  padding: 56px 0;
  border-top: 1px solid var(--about-muted-line);
  border-bottom: 1px solid var(--about-muted-line);
  background:
    linear-gradient(180deg, transparent, rgba(42, 27, 61, 0.55) 40%, transparent),
    var(--color-bg-deep);
}

.page-about .about-principles__head {
  display: grid;
  gap: 16px;
  align-items: start;
  margin-bottom: 32px;
}

.page-about .about-principles__index {
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  -webkit-text-stroke: 1px var(--color-purple);
}

.page-about .about-principles__head h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  color: var(--color-white);
}

.page-about .about-principles__head p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-principles__grid {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .principle-card {
  position: relative;
  padding: 20px 20px 20px 22px;
  border: 1px solid var(--about-muted-line);
  border-left: 3px solid var(--color-green);
  border-radius: var(--radius-md);
  background: rgba(22, 22, 34, 0.8);
  transition: transform var(--transition-slow), border-color var(--transition-base);
}

.page-about .principle-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 255, 136, 0.5);
}

.page-about .principle-card__tag {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--color-green);
}

.page-about .principle-card p {
  margin: 10px 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text);
}

.page-about .about-next {
  padding: 56px 0 64px;
  text-align: center;
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2rem);
  color: var(--color-white);
}

.page-about .about-next p {
  max-width: 520px;
  margin: 0 auto 28px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-hero__stat,
  .page-about .about-hero__stat:nth-child(2n) {
    border-right: 1px solid var(--about-muted-line);
    border-bottom: 0;
  }

  .page-about .about-hero__stat:last-child {
    border-right: 0;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .about-hero__mark {
    display: block;
    width: 200px;
    height: 200px;
    filter: drop-shadow(0 0 18px rgba(138, 43, 226, 0.25));
  }

  .page-about .timeline-chapter {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .timeline-chapter__details {
    max-width: 560px;
  }

  .page-about .timeline-chapter__figure img {
    max-width: 640px;
  }

  .page-about .timeline-chapter__stats {
    max-width: 560px;
  }

  .page-about .about-principles__head {
    grid-template-columns: 96px 1fr;
  }
}

@media (min-width: 1200px) {
  .page-about .timeline-chapter {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 64px;
    padding-left: 64px;
  }

  .page-about .about-hero__mark {
    width: 240px;
    height: 240px;
  }

  .page-about .about-hero__stats {
    margin-top: 48px;
  }
}