.page-about {
  --about-max-width: 1200px;
  --about-pad-x: 20px;
  --about-neon: linear-gradient(90deg, var(--color-accent-a), var(--color-accent-b));
  position: relative;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
}

.page-about::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image: radial-gradient(rgba(232, 234, 240, 0.12) 1px, transparent 1px);
  background-size: 4px 4px;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about::before {
    animation: pageAboutGrain 8s steps(5) infinite;
  }
}

@keyframes pageAboutGrain {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(1px, -1px); }
  40% { transform: translate(-1px, 1px); }
  60% { transform: translate(1px, 1px); }
  80% { transform: translate(-1px, -1px); }
}

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

.page-about .about-hero {
  padding: 64px 20px 56px;
  background:
    radial-gradient(ellipse 90% 60% at 85% -10%, rgba(229, 54, 138, 0.16), transparent 65%),
    radial-gradient(ellipse 70% 60% at 10% 110%, rgba(0, 212, 255, 0.12), transparent 60%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-hero-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
}

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

.page-about .hero-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-accent-b);
  margin-bottom: 18px;
}

.page-about .about-hero-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 22px;
  max-width: 900px;
}

.page-about .about-hero-desc {
  max-width: 760px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-text-muted);
  margin: 0 0 40px;
}

.page-about .about-hero-desc strong {
  color: var(--color-text);
  font-weight: 600;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
}

@media (min-width: 600px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  background: rgba(25, 27, 34, 0.82);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.page-about .hero-stat:hover {
  border-color: var(--color-accent-b);
  transform: translateY(-2px);
}

.page-about .hero-stat dt {
  order: 2;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.page-about .hero-stat dd {
  order: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--color-text);
}

.page-about .about-section {
  padding: 72px var(--about-pad-x);
  max-width: var(--about-max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 20px;
  align-items: start;
  margin-bottom: 44px;
}

.page-about .about-section-head .chapter-index {
  grid-row: 1 / 3;
  margin-top: 6px;
  font-size: 20px;
}

.page-about .about-section-head h2 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.page-about .section-lead {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 15px;
  color: var(--color-text-muted);
}

.page-about .brand-position-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

@media (min-width: 900px) {
  .page-about .brand-position-grid {
    grid-template-columns: 5fr 4fr;
    align-items: center;
    gap: 60px;
  }
}

.page-about .brand-copy p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.page-about .brand-copy p:first-of-type {
  font-size: 18px;
  color: var(--color-text);
  font-weight: 500;
}

.page-about .feature-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .feature-points li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.page-about .feature-points li::before {
  content: "▹";
  color: var(--color-accent-b);
  flex-shrink: 0;
}

.page-about .brand-media {
  margin: 0;
}

.page-about .brand-media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.page-about .brand-media figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-muted);
}

.page-about .timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .timeline-layout {
    grid-template-columns: 240px 1fr;
    gap: 56px;
  }

  .page-about .timeline-side {
    position: sticky;
    top: 88px;
    align-self: start;
  }
}

.page-about .ms-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (min-width: 900px) {
  .page-about .ms-track {
    flex-direction: column;
    gap: 6px;
    border-left: 1px solid var(--color-border);
    padding-left: 20px;
    position: relative;
  }

  .page-about .ms-track::before {
    content: "";
    position: absolute;
    left: -2px;
    top: 4px;
    width: 3px;
    height: 100%;
    background: var(--about-neon);
    border-radius: var(--radius-pill);
    opacity: 0.5;
  }
}

.page-about .ms-track a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid transparent;
  background: transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.page-about .ms-track a:hover,
.page-about .ms-track a:focus-visible,
.page-about .ms-track a[aria-current] {
  color: var(--color-text);
  background: var(--color-surface);
  border-color: var(--color-border);
}

.page-about .ms-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-surface-raised);
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-about .ms-track a:hover .ms-dot,
.page-about .ms-track a:focus-visible .ms-dot {
  background: var(--color-accent-a);
  border-color: var(--color-accent-b);
}

.page-about .timeline-panels {
  display: grid;
  gap: 20px;
}

.page-about .ms-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.page-about .ms-card:hover,
.page-about .ms-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-accent-a);
  box-shadow: var(--shadow-card);
}

.page-about .ms-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .ms-version {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, rgba(229, 54, 138, 0.18), rgba(0, 212, 255, 0.18));
  color: var(--color-text);
}

.page-about .ms-period {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-b);
}

.page-about .ms-card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  margin: 0 0 12px;
  color: var(--color-text);
}

.page-about .ms-card > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .ms-extra {
  margin-top: 16px;
  border-top: 1px dashed var(--color-border);
  padding-top: 12px;
}

.page-about .ms-extra-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-accent-a);
  margin: 0 0 6px;
}

.page-about .ms-extra p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin: 0;
}

@media (min-width: 901px) {
  .page-about .ms-extra {
    display: none;
  }

  .page-about .ms-card:hover .ms-extra,
  .page-about .ms-card:focus-within .ms-extra {
    display: block;
  }
}

.page-about .system-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .system-layout {
    grid-template-columns: 4fr 5fr;
    align-items: center;
    gap: 60px;
  }
}

.page-about .system-chart img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.page-about .system-explore {
  display: grid;
  gap: 20px;
}

.page-about .system-part {
  padding: 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.page-about .system-part:hover {
  border-color: var(--color-accent-b);
  transform: translateX(4px);
}

.page-about .part-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-accent-a);
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.page-about .system-part h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  margin: 0 0 10px;
  color: var(--color-text);
}

.page-about .system-part p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .service-guarantee {
  padding: 72px 0;
  background: linear-gradient(135deg, var(--color-nature-teal) 0%, var(--color-bg) 78%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.page-about .service-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
  padding: 0 var(--about-pad-x);
}

.page-about .service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 700px) {
  .page-about .service-list {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .service-item {
  position: relative;
  padding: 30px;
  background: rgba(25, 27, 34, 0.68);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.page-about .service-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-a);
}

.page-about .service-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--about-neon);
  opacity: 0.55;
}

.page-about .service-no {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-accent-b);
  opacity: 0.65;
}

.page-about .service-item h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  color: var(--color-text);
  margin: 12px 0 10px;
}

.page-about .service-item p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 234, 240, 0.84);
  margin: 0;
}

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: 5fr 4fr;
    align-items: center;
    gap: 60px;
  }
}

.page-about .team-copy p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.page-about .team-role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 28px 0;
}

@media (min-width: 600px) {
  .page-about .team-role-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

.page-about .team-role {
  padding: 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.page-about .team-role:hover {
  border-color: var(--color-accent-b);
  transform: translateY(-3px);
}

.page-about .team-role h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--color-accent-b);
  margin: 0 0 8px;
}

.page-about .team-role p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .team-media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.page-about .about-more {
  padding: 72px var(--about-pad-x);
  border-top: 1px solid var(--color-border);
}

.page-about .about-more-inner {
  max-width: var(--about-max-width);
  margin: 0 auto;
}

.page-about .more-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--color-accent-a);
  text-transform: uppercase;
  margin: 0 0 22px;
}

.page-about .more-link-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .more-link-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

.page-about .more-link {
  display: block;
  padding: 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.page-about .more-link:hover,
.page-about .more-link:focus-visible {
  border-color: var(--color-accent-a);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.page-about .more-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-b);
  display: block;
  margin-bottom: 10px;
}

.page-about .more-text {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

@media (max-width: 420px) {
  .page-about .about-hero {
    padding: 48px 16px 40px;
  }

  .page-about .about-section,
  .page-about .about-more {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-about .service-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-about .ms-card,
  .page-about .service-item,
  .page-about .system-part {
    padding: 22px;
  }
}