.page-about {
  --about-side-w: 260px;
  --about-gap: clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(circle at 85% 8%, rgba(0, 255, 135, 0.06), transparent 24rem),
    var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .breadcrumb {
  margin-inline: auto;
  max-width: var(--container);
  padding-inline: var(--space-4);
}

.page-about .about-hero {
  position: relative;
  padding-block: var(--space-6) var(--space-7);
  overflow: hidden;
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(0, 255, 135, 0.08) 0%, transparent 44%),
    linear-gradient(220deg, rgba(0, 212, 255, 0.06) 0%, transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-secondary));
  pointer-events: none;
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-tertiary);
}

.page-about .about-eyebrow::before {
  content: "";
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--accent-primary);
}

.page-about .about-hero-copy h1 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-about .about-lead {
  max-width: 46rem;
  margin-bottom: var(--space-4);
  font-size: 1.125rem;
  color: var(--text-primary);
}

.page-about .about-intro-text {
  max-width: 40rem;
  margin: 0;
  color: var(--text-secondary);
}

.page-about .about-hero-visual {
  position: relative;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  overflow: hidden;
  padding: var(--space-3);
}

.page-about .about-hero-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-svg-flow {
  stroke-dasharray: 8 10;
  animation: about-data-flow 18s linear infinite;
}

.page-about .about-svg-flow-two {
  animation-duration: 24s;
  animation-delay: -6s;
}

.page-about .about-svg-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: about-pulse 3.2s ease-in-out infinite;
}

.page-about .about-svg-pulse-two {
  animation-delay: -1.2s;
}

.page-about .about-svg-pulse-three {
  animation-delay: -0.6s;
}

@keyframes about-data-flow {
  to { stroke-dashoffset: -160; }
}

@keyframes about-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.page-about .about-main {
  padding-block: var(--space-7) var(--space-8);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-about .about-side {
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  padding: var(--space-4);
}

.page-about .about-side-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

.page-about .about-side-index {
  font-family: var(--font-heading);
  font-size: var(--fs-card);
  color: var(--accent-primary);
}

.page-about .about-side-title {
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .about-timeline li {
  margin: 0;
}

.page-about .about-timeline a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-small);
  color: var(--text-primary);
  text-decoration: none;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: rgba(10, 25, 47, 0.5);
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast);
}

.page-about .about-timeline a:hover,
.page-about .about-timeline a:focus-visible {
  border-color: var(--accent-tertiary);
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent-tertiary);
}

.page-about .tl-idx {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--accent-primary);
}

.page-about .about-content {
  display: grid;
  gap: var(--space-8);
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + var(--space-4));
}

.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-section-no {
  font-family: var(--font-heading);
  font-size: var(--fs-card);
  line-height: 1;
  color: var(--accent-primary);
}

.page-about .about-section-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--fs-section);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-section-intro {
  max-width: 62ch;
  margin-bottom: var(--space-5);
  color: var(--text-secondary);
}

.page-about .about-intro-copy {
  max-width: 68ch;
  margin-bottom: var(--space-5);
  color: var(--text-secondary);
}

.page-about .about-intro-copy p + p {
  margin-top: var(--space-3);
}

.page-about .about-fact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .page-about .about-fact-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .about-fact-card {
  position: relative;
  min-height: 118px;
  padding: var(--space-4);
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
}

.page-about .about-fact-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
  border-radius: 0 0 var(--radius-md) 0;
}

.page-about .about-fact-num {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: 1.875rem;
  line-height: 1.1;
  color: var(--accent-primary);
}

.page-about .about-fact-label {
  font-size: var(--fs-small);
  color: var(--text-secondary);
}

.page-about .about-stage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .page-about .about-stage-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-6);
    align-items: start;
  }
}

.page-about .about-stage-list {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-stage-card {
  position: relative;
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-left: 3px solid var(--accent-tertiary);
  border-radius: var(--radius-md);
  scroll-margin-top: calc(var(--header-h) + var(--space-5));
  transition:
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.page-about .about-stage-card:hover,
.page-about .about-stage-card:focus-within {
  transform: translateX(6px);
  border-left-color: var(--accent-primary);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.page-about .stage-year {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--accent-tertiary);
}

.page-about .about-stage-card h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--text-primary);
}

.page-about .about-stage-card p {
  margin: 0;
  color: var(--text-secondary);
}

.page-about .about-team-intro {
  max-width: 66ch;
  margin-bottom: var(--space-5);
  color: var(--text-secondary);
}

.page-about .about-team-media {
  margin-bottom: var(--space-5);
}

.page-about .about-panels {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-panel {
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
}

.page-about .about-panel-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: transparent;
  border: 0;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.page-about .about-panel-toggle:hover,
.page-about .about-panel-toggle:focus-visible {
  background: rgba(0, 255, 135, 0.06);
}

.page-about .about-panel-toggle::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-heading);
  color: var(--accent-primary);
  transition: transform var(--transition-fast);
}

.page-about .about-panel[data-open="true"] .about-panel-toggle::after {
  content: "－";
}

.page-about .about-panel-no {
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  color: var(--accent-primary);
}

.page-about .about-panel-body {
  display: block;
  padding: 0 var(--space-5) var(--space-4) calc(var(--space-5) + 1.75rem);
  color: var(--text-secondary);
}

.page-about .about-panel[data-open="false"] .about-panel-body {
  display: none;
}

.page-about .about-data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .page-about .about-data-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    gap: var(--space-6);
    align-items: start;
  }
}

.page-about .about-data-copy {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-data-point {
  padding-left: var(--space-4);
  border-left: 1px solid var(--accent-tertiary);
}

.page-about .about-data-point h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--text-primary);
}

.page-about .about-data-point p {
  margin: 0;
  color: var(--text-secondary);
}

.page-about .about-history-media,
.page-about .about-team-media,
.page-about .about-data-media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

.page-about .about-history-media {
  aspect-ratio: 5 / 3;
}

.page-about .about-team-media {
  aspect-ratio: 3 / 2;
}

.page-about .about-data-media {
  aspect-ratio: 4 / 3;
}

.page-about .about-history-media img,
.page-about .about-team-media img,
.page-about .about-data-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-vision {
  padding: var(--space-6);
  background:
    linear-gradient(135deg, rgba(0, 255, 135, 0.08), rgba(0, 212, 255, 0.04)),
    var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
}

.page-about .about-vision .about-section-head {
  border-bottom-color: rgba(0, 255, 135, 0.25);
}

.page-about .about-vision p {
  max-width: 64ch;
  margin: var(--space-3) 0;
  color: var(--text-secondary);
}

.page-about .about-vision p:first-of-type {
  font-size: 1.125rem;
  color: var(--text-primary);
}

.page-about .about-vision-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.page-about .about-vision-links .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-color: rgba(0, 255, 135, 0.45);
  color: var(--accent-primary);
}

.page-about .about-vision-links .btn-ghost:hover,
.page-about .about-vision-links .btn-ghost:focus-visible {
  border-color: var(--accent-primary);
  background: rgba(0, 255, 135, 0.1);
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-block: var(--space-8);
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-7);
    align-items: center;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-side-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: calc(var(--header-h) + var(--space-5));
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin-left: 7px;
    border-left: 1px solid var(--border-line);
  }

  .page-about .about-timeline li {
    position: relative;
    padding: 0;
  }

  .page-about .about-timeline li::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 1.2rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 0 5px rgba(0, 255, 135, 0.12);
    z-index: 1;
  }

  .page-about .about-timeline li:last-child::after {
    content: "";
    position: absolute;
    left: -1px;
    bottom: -1.4rem;
    width: 1px;
    height: 2.2rem;
    background: linear-gradient(180deg, var(--accent-tertiary), transparent);
  }

  .page-about .about-timeline a {
    padding: var(--space-3) var(--space-5);
    font-size: var(--fs-body);
    color: var(--text-secondary);
    background: transparent;
    border: 0;
    border-radius: 0;
  }

  .page-about .about-timeline a:hover,
  .page-about .about-timeline a:focus-visible {
    color: var(--accent-primary);
    background: transparent;
    border: 0;
  }

  .page-about .tl-idx {
    color: var(--accent-tertiary);
  }
}