.page-about {
  --angle: 8px;
  --grid-line: rgba(139, 157, 195, 0.08);
  position: relative;
  background-color: var(--primary-dark);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--off-white);
  line-height: 1.7;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-height) + 1rem);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.page-about .breadcrumb a {
  color: rgba(240, 244, 248, 0.72);
  text-decoration-color: transparent;
  transition: color 0.25s ease;
}

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

.page-about .breadcrumb-current {
  color: var(--fluorescent-green);
}

.page-about .about-hero {
  position: relative;
  padding-top: clamp(3rem, 8vw, 6rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  overflow: hidden;
}

.page-about .hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.35;
}

.page-about .hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10, 25, 47, 0.98) 0%, rgba(10, 25, 47, 0.78) 55%, rgba(10, 25, 47, 0.62) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .hero-side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.page-about .hero-keyword {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--white);
  background: rgba(27, 42, 74, 0.72);
  padding: 0.45rem 0.85rem;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.page-about .hero-main h1 {
  font-family: var(--font-heading);
  font-size: var(--text-h1);
  font-weight: 900;
  line-height: 1.14;
  margin: 0 0 1.25rem;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about .hero-lead {
  max-width: 42rem;
  font-size: 1.1rem;
  line-height: 1.8;
  color: rgba(240, 244, 248, 0.82);
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-hero-inner {
    grid-template-columns: 240px 1fr;
    gap: clamp(2rem, 5vw, 5rem);
  }
}

.page-about .story-section {
  padding-top: clamp(2.5rem, 6vw, 5rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
  scroll-margin-top: calc(var(--header-height) + 1rem);
  border-top: 1px solid rgba(139, 157, 195, 0.14);
}

.page-about .origin-section {
  border-top: 0;
}

.page-about .value-section {
  background: rgba(27, 42, 74, 0.3);
}

.page-about .story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .story-index {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about .story-num {
  font-family: var(--font-data);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--fluorescent-green);
  letter-spacing: -0.04em;
}

.page-about .story-index-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
  margin: 0;
}

.page-about .story-index::after {
  content: "";
  width: 3rem;
  height: 2px;
  background: var(--accent-orange);
  margin-top: 0.5rem;
}

@media (min-width: 860px) {
  .page-about .story-grid {
    grid-template-columns: minmax(220px, 280px) 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .story-index {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
    align-self: start;
  }
}

.page-about .story-lead {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--white);
  line-height: 1.7;
  margin: 0 0 1rem;
}

.page-about .story-content {
  max-width: 56rem;
}

.page-about .story-content p {
  margin-bottom: 1rem;
  line-height: 1.8;
  color: rgba(240, 244, 248, 0.78);
}

.page-about .origin-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

@media (min-width: 600px) {
  .page-about .origin-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .stat-card {
  padding: 1.25rem 1rem;
  background: rgba(27, 42, 74, 0.66);
  border-left: 3px solid var(--fluorescent-green);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: var(--text-data);
  font-weight: 600;
  color: var(--fluorescent-green);
  line-height: 1.2;
}

.page-about .stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.88rem;
  color: var(--slate-gray);
}

.page-about .timeline {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0 0 0 1.5rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--fluorescent-green) 0%, var(--chart-line) 45%, var(--accent-orange) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-left: 1.5rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--fluorescent-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.16);
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.page-about .timeline-item:hover::before,
.page-about .timeline-item:focus-within::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 8px rgba(0, 255, 136, 0.12);
  background: var(--accent-orange);
}

.page-about .timeline-year {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
  background: rgba(255, 107, 53, 0.1);
  padding: 0.25rem 0.6rem;
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--accent-orange);
  transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.page-about .timeline-item:hover .timeline-year {
  color: var(--fluorescent-green);
  border-left-color: var(--fluorescent-green);
  background: rgba(0, 255, 136, 0.08);
}

.page-about .timeline-body h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .timeline-body p {
  margin: 0 0 0.75rem;
  line-height: 1.75;
  color: rgba(240, 244, 248, 0.78);
}

.page-about .timeline-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  opacity: 0.72;
  transition: opacity 0.3s ease;
}

.page-about .timeline-item:hover .timeline-tags {
  opacity: 1;
}

.page-about .timeline-tags li {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--fluorescent-green);
  border: 1px solid rgba(0, 255, 136, 0.22);
  background: rgba(0, 255, 136, 0.05);
  padding: 0.2rem 0.5rem;
  clip-path: polygon(0 0, calc(100% - 4px) 0, 100% 4px, 100% 100%, 4px 100%, 0 calc(100% - 4px));
}

.page-about .trend-chart {
  margin: 2.5rem 0 0;
  padding: 0;
}

.page-about .trend-chart img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  border: 1px solid rgba(139, 157, 195, 0.24);
}

.page-about .trend-chart figcaption {
  margin-top: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--slate-gray);
  text-align: right;
}

.page-about .value-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

@media (min-width: 800px) {
  .page-about .value-layout {
    grid-template-columns: 1.3fr 0.8fr;
    align-items: start;
  }
}

.page-about .values-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 1120px) {
  .page-about .values-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .value-card {
  background: linear-gradient(135deg, var(--deep-blue), rgba(27, 42, 74, 0.62));
  padding: 1.5rem 1.25rem;
  border: 1px solid rgba(139, 157, 195, 0.16);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about .value-card:hover {
  border-color: rgba(0, 255, 136, 0.4);
  transform: translateY(-4px);
}

.page-about .value-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 0.5rem;
  padding-left: 1.25rem;
  position: relative;
}

.page-about .value-card h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 0.7rem;
  height: 0.7rem;
  background: var(--fluorescent-green);
  transform: rotate(-12deg);
}

.page-about .value-card p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(240, 244, 248, 0.78);
  margin: 0;
}

.page-about .algorithm-image {
  margin: 0;
}

.page-about .algorithm-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  border: 1px solid rgba(139, 157, 195, 0.2);
}

.page-about .algorithm-image figcaption {
  margin-top: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--slate-gray);
  text-align: left;
}

.page-about .license-content {
  max-width: 48rem;
}

.page-about .license-content a {
  color: var(--fluorescent-green);
  text-decoration-color: rgba(0, 255, 136, 0.4);
  transition: text-decoration-color 0.25s ease;
}

.page-about .license-content a:hover {
  text-decoration-color: var(--fluorescent-green);
}

.page-about .license-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .btn-primary {
  background: var(--fluorescent-green);
  border-color: var(--fluorescent-green);
  color: var(--primary-dark);
}

.page-about .btn-outline {
  border-color: rgba(139, 157, 195, 0.4);
  color: var(--off-white);
}

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