.page-about {
  --about-bg: #081426;
  --about-panel: #0b1a33;
  --about-panel-2: #0e2144;
  --about-line: rgba(255, 255, 255, 0.18);
  --about-line-strong: rgba(255, 255, 255, 0.32);
  --about-cyan: #00D4FF;
  --about-blue: #1B4FDB;
  --about-orange: #FF6B2C;
  --about-green: #00E5A0;
  --about-amber: #FFC700;
  --about-text: #EAF2FF;
  --about-text-dim: #A8BAD8;
  --about-mono: 'IBM Plex Mono', SFMono-Regular, monospace;
  --about-headline: 'Barlow Condensed', 'Noto Sans SC', sans-serif;
  --about-body: 'Noto Sans SC', sans-serif;

  background: var(--about-bg);
  color: var(--about-text);
  font-family: var(--about-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.about-shell {
  display: grid;
  grid-template-columns: 1fr;
  min-width: 0;
}

.about-brand-column {
  background:
    radial-gradient(circle at 15% 20%, rgba(0, 212, 255, 0.12), transparent 38%),
    linear-gradient(135deg, #0A1D3E 0%, #091630 60%, #060D1F 100%);
  border-bottom: 2px solid var(--about-line);
  padding: 32px 20px 36px;
  position: relative;
}

.about-brand-column::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.06) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}

.page-about .about-brand-column > * {
  position: relative;
  z-index: 1;
}

.index-overline {
  font-family: var(--about-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--about-cyan);
  margin: 0 0 28px;
  text-transform: uppercase;
}

.brand-side-title {
  font-family: var(--about-headline);
  font-size: clamp(42px, 10vw, 76px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.04em;
  margin: 0 0 20px;
  color: var(--about-text);
  writing-mode: vertical-rl;
  max-height: 340px;
  padding-left: 6px;
  border-left: 4px solid var(--about-cyan);
}

.brand-side-code {
  font-family: var(--about-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--about-text-dim);
  margin: 0 0 36px;
}

.legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
  border-top: 2px solid var(--about-line);
  border-bottom: 2px solid var(--about-line);
  padding: 18px 0;
  margin-bottom: 28px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 12px;
  height: 12px;
  flex: 0 0 12px;
  border: 2px solid transparent;
}

.legend-dot-a {
  background: var(--about-cyan);
}

.legend-dot-b {
  background: var(--about-orange);
}

.legend-dot-c {
  background: var(--about-blue);
}

.legend-dot-d {
  background: var(--about-green);
}

.legend-text {
  font-size: 13px;
  color: var(--about-text-dim);
  letter-spacing: 0.04em;
}

.side-route {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
}

.side-route-title {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-text-dim);
  margin: 0;
  letter-spacing: 0.08em;
}

.side-route-link {
  font-size: 14px;
  color: var(--about-text);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line-strong);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.side-route-link:hover {
  color: var(--about-cyan);
  border-color: var(--about-cyan);
}

.about-content-column {
  padding: 24px 20px 48px;
  min-width: 0;
}

.about-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--about-line);
}

.tool-link {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-text-dim);
  text-decoration: none;
  letter-spacing: 0.04em;
  padding: 4px 0;
  position: relative;
}

.tool-link:hover {
  color: var(--about-cyan);
}

.about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 8px 0 40px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--about-line);
}

.hero-copy {
  min-width: 0;
}

.section-index-code {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.14em;
  margin: 0 0 12px;
  display: inline-block;
  border: 1px solid var(--about-line);
  padding: 3px 10px;
}

.page-title {
  font-family: var(--about-headline);
  font-size: var(--h1-size);
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
}

.page-intro {
  font-size: 17px;
  line-height: 1.8;
  color: var(--about-text);
  margin: 0 0 16px;
  max-width: 640px;
}

.trust-line {
  font-size: 14px;
  color: var(--about-text-dim);
  border-left: 3px solid var(--about-green);
  padding-left: 12px;
  margin: 0;
}

.hero-aside {
  position: relative;
  min-height: 200px;
  overflow: hidden;
  border: 2px solid var(--about-line);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.25);
}

.hero-bg-image {
  width: 100%;
  height: 100%;
  min-height: 200px;
  max-height: 360px;
  object-fit: cover;
  display: block;
  filter: saturate(0.85) contrast(1.1);
}

.hero-coord {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: flex;
  gap: 8px;
  background: rgba(8, 12, 26, 0.78);
  padding: 8px 12px;
  border: 1px solid var(--about-line-strong);
}

.coord-item {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.06em;
}

.about-section {
  padding: 44px 0 12px;
  border-bottom: 2px solid var(--about-line);
  margin-bottom: 8px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
}

.section-heading .section-index-code {
  margin: 0;
  flex: 0 0 auto;
}

.section-heading h2 {
  font-family: var(--about-headline);
  font-size: var(--h2-size);
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.03em;
  line-height: 1.2;
}

.position-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 26px;
}

.position-block {
  background: var(--about-panel);
  border: 2px solid var(--about-line);
  padding: 20px 22px;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.25);
}

.block-kicker {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.12em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.block-copy {
  font-size: 15px;
  color: var(--about-text);
  margin: 0;
  line-height: 1.7;
}

.position-note {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: rgba(255, 107, 44, 0.08);
  border-left: 4px solid var(--about-orange);
  padding: 16px 18px;
}

.note-tag {
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  white-space: nowrap;
  border: 1px solid var(--about-orange);
  color: var(--about-orange);
}

.position-note p {
  margin: 0;
  font-size: 14px;
  color: var(--about-text);
  line-height: 1.7;
}

.timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.timeline-visual {
  border: 2px solid var(--about-line);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.25);
  overflow: hidden;
  background: var(--about-panel);
}

.timeline-visual img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.1);
}

.timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline-item {
  display: grid;
  grid-template-columns: 76px 22px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
  position: relative;
}

.timeline-item:last-child {
  border-bottom: none;
}

.timeline-year {
  font-family: var(--about-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--about-text);
  padding: 6px 0;
  border-top: 3px solid var(--about-cyan);
}

.timeline-connector {
  width: 12px;
  height: 12px;
  border: 3px solid var(--about-cyan);
  background: var(--about-bg);
  margin-top: 12px;
  outline: 2px solid rgba(0, 212, 255, 0.25);
  outline-offset: 2px;
}

.timeline-body {
  padding-top: 2px;
}

.timeline-title {
  font-family: var(--about-headline);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: 0.02em;
}

.timeline-desc {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  line-height: 1.65;
}

.timeline-tail {
  font-size: 14px;
  color: var(--about-text-dim);
  border-top: 2px dashed var(--about-line);
  padding-top: 18px;
  margin: 28px 0 0;
}

.system-intro p {
  font-size: 15px;
  color: var(--about-text-dim);
  margin: 0 0 22px;
  max-width: 680px;
}

.system-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 28px;
}

.system-card {
  background: var(--about-panel);
  border: 2px solid var(--about-line);
  padding: 22px 20px 18px;
  position: relative;
  transition: border-color 0.2s ease;
}

.system-card:hover {
  border-color: var(--about-cyan);
}

.system-card-index {
  font-family: var(--about-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--about-cyan);
  display: block;
  margin-bottom: 14px;
  line-height: 1;
}

.system-card-title {
  font-family: var(--about-headline);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}

.system-card-copy {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0 0 16px;
  line-height: 1.7;
}

.system-card-tag {
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-cyan);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
  display: inline-block;
}

.system-card-state {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--about-mono);
  font-size: 12px;
  color: var(--about-green);
  background: rgba(0, 229, 160, 0.1);
  padding: 3px 8px;
  border: 1px solid rgba(0, 229, 160, 0.4);
}

.system-card:nth-child(2) .system-card-state {
  color: var(--about-orange);
  background: rgba(255, 107, 44, 0.1);
  border-color: rgba(255, 107, 44, 0.4);
}

.system-card:nth-child(3) .system-card-state {
  color: var(--about-cyan);
  border-color: rgba(0, 212, 255, 0.4);
}

.system-card:nth-child(4) .system-card-state {
  color: var(--about-amber);
  border-color: rgba(255, 199, 0, 0.4);
}

.system-foot {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: center;
}

.system-foot img {
  width: 100%;
  height: auto;
  display: block;
  border: 2px solid var(--about-line);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.25);
  object-fit: cover;
  filter: saturate(0.85);
}

.system-foot-note {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  border-left: 3px solid var(--about-cyan);
  padding-left: 12px;
}

.service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.service-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px 18px;
  align-items: baseline;
  background: var(--about-panel);
  border: 2px solid var(--about-line);
  padding: 18px 20px;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
}

.service-row-index {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.1em;
}

.service-row-num {
  font-family: var(--about-mono);
  font-size: 34px;
  font-weight: 700;
  color: var(--about-text);
  line-height: 1.1;
}

.service-row-unit {
  font-size: 18px;
  color: var(--about-cyan);
  margin-left: 2px;
}

.service-row-label {
  font-family: var(--about-headline);
  font-size: 18px;
  font-weight: 700;
  color: var(--about-orange);
  letter-spacing: 0.04em;
}

.service-row-desc {
  font-size: 14px;
  color: var(--about-text-dim);
  margin: 0;
  line-height: 1.6;
}

.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.trust-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}

.trust-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.trust-item-code {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.08em;
}

.trust-item-text {
  font-size: 14px;
  color: var(--about-text);
  line-height: 1.7;
}

.trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.trust-aside {
  background: var(--about-panel-2);
  border: 2px solid var(--about-line);
  padding: 24px 22px;
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.25);
  position: relative;
  overflow: hidden;
}

.trust-aside::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, transparent 48%, rgba(0, 212, 255, 0.14) 50%, transparent 52%);
  transform: rotate(45deg);
}

.trust-aside-title {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-cyan);
  letter-spacing: 0.14em;
  margin: 0 0 10px;
  text-transform: uppercase;
}

.trust-aside-text {
  font-size: 15px;
  color: var(--about-text);
  margin: 0 0 20px;
  line-height: 1.7;
}

.trust-status {
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--about-green);
  border: 1px solid rgba(0, 229, 160, 0.5);
  padding: 5px 12px;
  display: inline-block;
  letter-spacing: 0.08em;
}

.btn {
  display: inline-block;
  font-family: var(--about-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding: 10px 20px;
  border: 2px solid var(--about-line-strong);
  color: var(--about-text);
  background: transparent;
  transition: border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  border-color: var(--about-cyan);
  color: var(--about-cyan);
  box-shadow: 4px 4px 0 rgba(0, 212, 255, 0.2);
}

@media (min-width: 1024px) {
  .page-about {
    background:
      linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px),
      linear-gradient(0deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px),
      var(--about-bg);
    background-size: 44px 44px;
  }

  .about-shell {
    grid-template-columns: 340px minmax(0, 1fr);
    min-height: 100vh;
    max-width: 1440px;
    margin: 0 auto;
  }

  .about-brand-column {
    position: sticky;
    top: 0;
    height: 100vh;
    border-bottom: none;
    border-right: 2px solid var(--about-line);
    padding: 56px 36px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
  }

  .brand-side-title {
    font-size: 68px;
    max-height: 300px;
  }

  .legend {
    grid-template-columns: 1fr;
    margin-top: auto;
    margin-bottom: 24px;
  }

  .side-route {
    flex-direction: column;
    gap: 10px;
  }

  .about-content-column {
    padding: 40px 56px 80px;
  }

  .about-hero {
    grid-template-columns: 1.3fr 0.9fr;
    gap: 40px;
    align-items: center;
    padding: 28px 0 48px;
  }

  .page-title {
    font-size: 46px;
  }

  .hero-aside {
    min-height: 280px;
  }

  .hero-bg-image {
    min-height: 280px;
    max-height: 420px;
  }

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

  .timeline-wrap {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 40px;
    align-items: start;
  }

  .timeline-visual {
    position: sticky;
    top: 32px;
  }

  .system-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .system-foot {
    grid-template-columns: 1fr 1.2fr;
    gap: 28px;
  }

  .service-row {
    grid-template-columns: 64px 130px 120px 1fr;
    gap: 18px;
    align-items: center;
    padding: 16px 24px;
  }

  .service-row-num {
    font-size: 40px;
  }

  .service-row-desc {
    text-align: right;
  }

  .trust-grid {
    grid-template-columns: 1.4fr 0.9fr;
    gap: 36px;
    align-items: start;
  }

  .trust-aside {
    position: sticky;
    top: 32px;
  }
}

@media (min-width: 720px) and (max-width: 1023px) {
  .position-grid {
    grid-template-columns: 1fr 1fr;
  }

  .system-grid {
    grid-template-columns: 1fr 1fr;
  }

  .service-row {
    grid-template-columns: 60px 120px 110px 1fr;
    gap: 14px;
    align-items: center;
  }

  .system-foot {
    grid-template-columns: 1fr;
  }
}