.page-about {
  background-color: var(--bg-deep);
  color: var(--text-light);
  font-family: var(--font-body);
  min-height: 100vh;
}

.page-about__shell {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.page-about__rail {
  background:
    linear-gradient(135deg, rgba(94, 43, 61, 0.55), rgba(61, 43, 94, 0.5)),
    var(--bg-panel);
  border-bottom: 1px solid var(--line-white);
  padding: calc(var(--header-h) + 24px) var(--page-gutter) 28px;
}

.page-about__rail-inner {
  max-width: 560px;
  margin: 0 auto;
}

.page-about .breadcrumb {
  margin-bottom: 18px;
}

.page-about .breadcrumb a {
  color: var(--accent-blue);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--accent-green);
}

.page-about__title {
  margin: 16px 0 4px;
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
  transform: skewX(-6deg);
  transform-origin: left center;
}

.page-about__slogan {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 700;
  color: var(--accent-green);
  letter-spacing: 0.04em;
}

.page-about__intro {
  color: var(--text-mid);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 34em;
}

.page-about__intro b {
  color: var(--text-light);
}

.page-about__metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0 20px;
}

.page-about__metric {
  background: rgba(10, 46, 61, 0.7);
  border: 1px solid var(--line-white);
  border-top: 2px solid var(--accent-green);
  padding: 12px 14px;
}

.page-about__metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--num-yellow);
  animation: page-about-pulse 2.4s ease-in-out infinite;
}

.page-about__metric-suffix {
  font-size: 0.7em;
  color: var(--accent-green);
}

.page-about__metric-label {
  display: block;
  margin-top: 6px;
  color: var(--text-mid);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.page-about__anchors {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin: 20px 0 18px;
}

.page-about__anchor {
  color: var(--accent-blue);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 6px 6px 0;
  border-bottom: 1px solid var(--line-white);
  transition: color 0.2s, border-color 0.2s;
}

.page-about__anchor:hover {
  color: var(--accent-green);
  border-bottom-color: var(--accent-green);
}

.page-about__rail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about__content {
  min-width: 0;
  width: 100%;
}

.page-about__timeline-section,
.page-about__metrics-section,
.page-about__tech-section,
.page-about__philosophy-section {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about__timeline-section {
  position: relative;
  overflow: hidden;
  padding: 48px var(--page-gutter) 48px;
  border-bottom: 1px solid var(--line-white);
}

.page-about__bg-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

.page-about__section-head {
  position: relative;
  z-index: 1;
  margin-bottom: 24px;
}

.page-about .section-head__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-green);
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}

.page-about .section-head__title {
  display: inline-block;
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.05;
  transform: skewX(-8deg);
  transform-origin: left center;
  margin: 0 0 8px;
}

.page-about .section-head__desc {
  color: var(--text-mid);
  max-width: 36em;
  margin: 0;
  font-size: 0.9rem;
}

.page-about__timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  max-width: 1240px;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 22px;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: -18px;
  width: 2px;
  background: linear-gradient(180deg, var(--bg-indigo), var(--accent-green));
  opacity: 0.5;
}

.page-about__timeline-item:last-child::before {
  display: none;
}

.page-about__timeline-detail {
  background: rgba(10, 46, 61, 0.72);
  border: 1px solid var(--line-white);
  border-left: 3px solid var(--bg-indigo);
  transition: border-color 0.25s, background 0.25s;
}

.page-about__timeline-detail[open] {
  border-left-color: var(--accent-green);
}

.page-about__timeline-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 14px 14px 18px;
  user-select: none;
}

.page-about__timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about__timeline-summary::marker {
  content: "";
}

.page-about__timeline-year {
  min-width: 64px;
  padding: 5px 8px;
  background: var(--bg-indigo);
  color: var(--num-yellow);
  font-family: var(--font-mono);
  font-weight: 700;
  text-align: center;
  transform: skewX(-8deg);
}

.page-about__timeline-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.page-about__timeline-toggle {
  margin-left: auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.2s, background 0.2s;
}

.page-about__timeline-detail[open] .page-about__timeline-toggle {
  transform: rotate(45deg);
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: #0B0F19;
}

.page-about__timeline-body {
  padding: 0 16px 18px 18px;
}

.page-about__timeline-body p {
  margin: 0 0 10px;
  color: var(--text-mid);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about__metrics-section {
  padding: 48px var(--page-gutter);
  background:
    linear-gradient(100deg, rgba(61, 43, 94, 0.25), rgba(10, 46, 61, 0.8)),
    var(--bg-deep);
  border-bottom: 1px solid var(--line-white);
}

.page-about__metrics-visual {
  border: 1px solid var(--line-white);
  margin-bottom: 24px;
  max-width: 1240px;
}

.page-about__metrics-visual img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__metrics-grid {
  gap: 16px;
  max-width: 1240px;
}

.page-about__metric-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line-white);
  border-bottom: 2px solid var(--accent-blue);
  padding: 18px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about__metric-card .page-about__metric-label {
  color: var(--text-mid);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.page-about__metric-value {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--num-yellow);
  line-height: 1;
  text-shadow: 0 0 12px rgba(255, 193, 7, 0.25);
}

.page-about__metric-card .page-about__metric-suffix {
  color: var(--accent-green);
  font-size: 0.55em;
}

.page-about__metric-text {
  margin: auto 0 0;
  color: var(--text-mid);
  font-size: 0.82rem;
  line-height: 1.5;
}

.page-about__tech-section {
  padding: 48px var(--page-gutter);
  background:
    linear-gradient(135deg, rgba(10, 46, 61, 0.9), rgba(61, 43, 94, 0.6)),
    var(--bg-deep);
  border-bottom: 1px solid var(--line-white);
}

.page-about__tech-grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
  max-width: 1240px;
}

.page-about__tech-img-wrap {
  border: 1px solid var(--line-white);
  overflow: hidden;
}

.page-about__tech-img-wrap img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__pipeline {
  display: grid;
  gap: 12px;
}

.page-about__pipeline-step {
  background: rgba(11, 15, 25, 0.55);
  border: 1px solid var(--line-white);
  padding: 16px 18px;
  position: relative;
}

.page-about__pipeline-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent-green), var(--accent-blue));
}

.page-about__pipeline-num {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.page-about__pipeline-step h3 {
  font-family: var(--font-head);
  font-size: 1.05rem;
  margin: 6px 0 6px;
}

.page-about__pipeline-step p {
  color: var(--text-mid);
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0;
}

.page-about__tech-facts {
  margin-top: 24px;
  background: rgba(11, 15, 25, 0.55);
  border: 1px solid var(--line-white);
  padding: 4px 16px;
}

.page-about .data-row {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-white);
}

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

.page-about .data-row__label {
  color: var(--text-mid);
}

.page-about .data-row__value {
  font-family: var(--font-mono);
  color: var(--num-yellow);
  text-align: right;
}

.page-about__tech-note {
  margin-top: 18px;
  color: var(--text-mid);
  font-size: 0.85rem;
  line-height: 1.7;
}

.page-about__tech-note b {
  color: var(--accent-green);
}

.page-about__philosophy-section {
  padding: 48px var(--page-gutter) 64px;
  background:
    linear-gradient(160deg, rgba(94, 43, 61, 0.55), rgba(11, 15, 25, 0.85)),
    var(--bg-deep);
}

.page-about__philosophy-grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
  max-width: 1240px;
}

.page-about__philosophy-quote {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 800;
  margin: 0 0 12px;
  color: var(--accent-green);
  transform: skewX(-6deg);
  transform-origin: left center;
}

.page-about__philosophy-text {
  color: var(--text-mid);
  line-height: 1.8;
  max-width: 38em;
}

.page-about__philosophy-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about__philosophy-list li {
  position: relative;
  padding-left: 18px;
  color: var(--text-mid);
  line-height: 1.6;
}

.page-about__philosophy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--accent-blue);
  transform: skewX(-12deg);
}

.page-about__philosophy-aside {
  background: var(--bg-indigo);
  border: 1px solid var(--line-white);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about__philosophy-note {
  color: var(--text-light);
  font-size: 0.9rem;
  margin: 0 0 6px;
}

@keyframes page-about-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.72;
  }
}

@media (min-width: 880px) {
  .page-about__shell {
    display: grid;
    grid-template-columns: minmax(280px, var(--rail-width)) 1fr;
    align-items: start;
  }

  .page-about__rail {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    border-right: 1px solid var(--line-white);
    border-bottom: 0;
    padding: calc(var(--header-h) + 28px) 28px 40px;
  }

  .page-about__rail-inner {
    max-width: 100%;
  }

  .page-about__timeline-section,
  .page-about__metrics-section,
  .page-about__tech-section,
  .page-about__philosophy-section {
    padding-right: 40px;
    padding-left: 40px;
  }

  .page-about__timeline-section {
    padding-top: calc(var(--header-h) + 40px);
  }

  .page-about__content {
    width: auto;
  }
}

@media (min-width: 1080px) {
  .page-about__tech-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }

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