.page-about {
  --about-spacing: 72px;
  --about-card-bg: #161616;
  --about-card-line: rgba(255, 255, 255, 0.08);
  --about-grid-line: rgba(255, 255, 255, 0.04);
  --about-timeline-line: 6px;
  background: var(--color-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 56px) 0 48px;
  background:
    radial-gradient(ellipse at 80% 10%, rgba(200, 16, 46, 0.28), transparent 55%),
    linear-gradient(135deg, var(--color-carbon) 0%, var(--color-black) 55%, var(--color-carbon) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about .about-hero__tilt {
  position: absolute;
  right: -60px;
  bottom: -40px;
  width: 200px;
  height: 60px;
  background: var(--color-red);
  transform: rotate(-12deg) skewX(-12deg);
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-hero__breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 40px;
  font-size: 13px;
  color: var(--text-muted);
}

.page-about .about-hero__breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--speed) var(--ease);
}

.page-about .about-hero__breadcrumb a:hover {
  color: var(--color-white);
}

.page-about .about-hero__breadcrumb span[aria-current="page"] {
  color: var(--text-secondary);
}

.page-about .about-hero__index {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-gold);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 2px;
  background: rgba(212, 175, 55, 0.06);
}

.page-about .about-hero__content h1 {
  max-width: 720px;
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.12;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  font-style: italic;
  color: var(--color-white);
}

.page-about .about-hero__lead {
  max-width: 600px;
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .about-hero__meta {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
}

.page-about .about-hero__meta-item {
  padding: 6px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-card-line);
  border-radius: 2px;
}

.page-about .about-section {
  padding: var(--about-spacing) 0;
}

.page-about .about-section__header {
  margin-bottom: 36px;
}

.page-about .about-section__title {
  margin: 12px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.18;
  font-style: italic;
  color: var(--color-white);
}

.page-about .about-section__subtitle {
  margin-top: 16px;
  max-width: 620px;
  font-size: 16px;
  color: var(--text-secondary);
}

.page-about .about-origin {
  background: linear-gradient(180deg, var(--color-black), rgba(13, 13, 13, 0.6));
}

.page-about .about-origin__grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .about-origin__content p {
  margin: 0 0 16px;
  font-size: 16px;
  color: var(--text-secondary);
}

.page-about .about-origin__lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-primary);
  border-left: 3px solid var(--color-red);
  padding-left: 18px;
}

.page-about .about-origin__figure,
.page-about .about-version__figure,
.page-about .about-principles__figure {
  margin: 0;
}

.page-about .about-origin__figure img,
.page-about .about-version__figure img,
.page-about .about-principles__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .about-version {
  background: linear-gradient(135deg, rgba(13, 13, 13, 0.9), rgba(26, 26, 26, 0.5));
}

.page-about .about-version__layout {
  display: flex;
  flex-direction: column;
}

.page-about .about-timeline {
  position: relative;
  margin-top: 4px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-timeline-line);
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-red) 0%, var(--color-gold) 70%, transparent 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 36px;
  padding-bottom: 44px;
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-red);
  border: 3px solid var(--color-carbon);
  box-shadow: 0 0 0 2px var(--color-red);
}

.page-about .about-timeline__item:last-child .about-timeline__node {
  background: var(--color-gold);
  box-shadow: 0 0 0 2px var(--color-gold);
}

.page-about .about-timeline__card {
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-line);
  border-left: 3px solid var(--color-red);
  border-radius: var(--radius);
  transition: border-color var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .about-timeline__card:hover {
  border-color: rgba(200, 16, 46, 0.6);
  transform: translateY(-2px);
}

.page-about .about-timeline__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.page-about .about-timeline__version {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-gold);
}

.page-about .about-timeline__season {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--color-white);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.page-about .about-version__figure {
  margin-top: 40px;
}

.page-about .about-v4 {
  position: relative;
  background:
    radial-gradient(ellipse at 20% 80%, rgba(200, 16, 46, 0.16), transparent 50%),
    var(--color-carbon);
  overflow: hidden;
}

.page-about .about-v4__tilt {
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 48px;
  background: var(--color-red);
  transform: skewX(-12deg);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-v4__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-v4__card {
  position: relative;
  padding: 28px 24px 24px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .about-v4__card:hover {
  transform: translateY(-3px);
  border-color: rgba(200, 16, 46, 0.5);
}

.page-about .about-v4__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 4px;
  background: var(--color-red);
}

.page-about .about-v4__num {
  display: block;
  margin-bottom: 16px;
  font-size: 28px;
  font-weight: 700;
  color: rgba(200, 16, 46, 0.5);
}

.page-about .about-v4__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 22px;
  color: var(--color-white);
}

.page-about .about-v4__card p {
  margin: 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.page-about .about-principles {
  background: linear-gradient(180deg, var(--color-black), rgba(13, 13, 13, 0.7));
}

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-principles__item {
  padding: 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--about-card-line);
  border-radius: var(--radius);
  transition: background var(--speed) var(--ease);
}

.page-about .about-principles__item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-principles__letter {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gold);
  border-bottom: 2px solid var(--color-gold);
  padding-bottom: 4px;
}

.page-about .about-principles__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-white);
}

.page-about .about-principles__item p {
  margin: 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.page-about .about-principles__figure {
  margin-top: 32px;
}

.page-about .about-future {
  background: linear-gradient(180deg, var(--color-carbon), var(--color-black));
  text-align: center;
}

.page-about .about-future__inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 0 8px;
}

.page-about .about-future__inner > .section-index {
  color: var(--color-gold);
}

.page-about .about-future__inner p {
  max-width: 620px;
  margin: 0 auto 16px;
  font-size: 16px;
  color: var(--text-secondary);
}

.page-about .about-future__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-future__contact-note {
  margin-top: 28px;
  font-size: 14px;
  color: var(--text-muted);
}

.page-about .about-future__contact-note a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (min-width: 768px) {
  .page-about {
    --about-spacing: 96px;
  }

  .page-about .about-hero {
    padding: calc(var(--header-h) + 80px) 0 72px;
  }

  .page-about .about-hero__meta {
    gap: 16px;
  }

  .page-about .about-origin__grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 48px;
  }

  .page-about .about-origin__content {
    flex: 1.1;
  }

  .page-about .about-origin__figure {
    flex: 0.9;
  }

  .page-about .about-version__layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-version__figure {
    margin: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-v4__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-principles__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-principles__layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-future__actions {
    flex-direction: row;
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-spacing: 120px;
  }

  .page-about .about-section__header {
    margin-bottom: 48px;
  }

  .page-about .about-hero__content h1 {
    font-size: 72px;
  }

  .page-about .about-timeline__card {
    padding: 24px 28px;
  }
}