.page-about {
  --about-rule: rgba(0, 229, 255, 0.16);
  --about-gold-line: rgba(212, 175, 55, 0.4);
  --about-card-bg: linear-gradient(145deg, rgba(18, 59, 110, 0.7), rgba(10, 30, 60, 0.9));
  --about-layer-glow: rgba(0, 229, 255, 0.08);
}

.page-about .about-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 56px);
}

.page-about .about-shell .breadcrumb {
  margin-bottom: 20px;
}

.page-about .breadcrumb a {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--gold);
  color: var(--champagne);
}

.page-about .breadcrumb .breadcrumb-sep {
  color: var(--neon);
  margin: 0 8px;
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 8px 0 20px;
  background: radial-gradient(900px 420px at 85% -10%, rgba(157, 78, 221, 0.14), transparent 60%),
    radial-gradient(700px 360px at 0% 10%, rgba(0, 229, 255, 0.07), transparent 55%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -1px 0;
  z-index: -1;
  border-top: 1px solid rgba(212, 175, 55, 0.18);
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
  pointer-events: none;
}

.page-about .about-hero h1 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.7rem, 4.2vw, 2.9rem);
  line-height: 1.24;
  margin: 18px 0 14px;
  color: var(--white);
  letter-spacing: -0.01em;
  max-width: 960px;
}

.page-about .about-hero-accent {
  display: block;
  color: var(--champagne);
  text-shadow: 0 0 28px rgba(212, 175, 55, 0.2);
}

.page-about .about-hero-desc {
  font-family: var(--font-serif);
  color: var(--silver);
  line-height: 1.9;
  font-size: 1.05rem;
  max-width: 66ch;
  margin: 0;
}

.page-about .about-chapter-preview {
  margin-top: 32px;
}

.page-about .about-chapter-preview .preview-card {
  border-color: rgba(0, 229, 255, 0.2);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-chapter-preview .preview-card:hover,
.page-about .about-chapter-preview .preview-card:focus-visible,
.page-about .about-chapter-preview .preview-card.active {
  border-color: rgba(212, 175, 55, 0.65);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.page-about .about-section {
  margin-top: clamp(48px, 7vw, 88px);
  scroll-margin-top: 88px;
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-section-num {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid rgba(212, 175, 55, 0.45);
  padding: 4px 10px;
  border-radius: 3px;
  line-height: 1;
}

.page-about .about-section-head h2 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  margin: 0;
  color: var(--white);
}

.page-about .about-section-desc {
  width: 100%;
  margin: 0;
  color: var(--silver);
  font-family: var(--font-serif);
  line-height: 1.75;
  max-width: 720px;
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-copy p {
  font-family: var(--font-serif);
  line-height: 1.9;
  color: var(--silver);
  margin: 0 0 16px;
  font-size: 0.98rem;
}

.page-about .about-copy b {
  color: var(--champagne);
  font-weight: 700;
}

.page-about .about-trust {
  position: relative;
  margin: 22px 0 0;
  padding: 16px 18px 16px 22px;
  background: rgba(18, 59, 110, 0.4);
  border-left: 3px solid var(--gold);
  border-radius: 0 10px 10px 0;
  color: var(--silver);
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-fact-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-fact {
  background: rgba(18, 59, 110, 0.48);
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.page-about .about-fact .stat-num {
  display: block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.8rem;
  color: var(--gold);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--silver);
  font-family: var(--font-sans);
  line-height: 1.4;
}

.page-about .about-timeline {
  position: relative;
  margin-top: 12px;
  padding: 4px 0 8px;
  background: radial-gradient(ellipse at 18% 0%, rgba(157, 78, 221, 0.06), transparent 48%),
    radial-gradient(ellipse at 85% 100%, rgba(0, 229, 255, 0.05), transparent 40%);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(0, 229, 255, 0.32), var(--neon), transparent);
  border-radius: 2px;
  z-index: 1;
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 30px;
  margin-bottom: 24px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.16), 0 0 16px rgba(212, 175, 55, 0.5);
  transform: translateX(-50%);
  z-index: 2;
}

.page-about .about-tl-card {
  position: relative;
  background: linear-gradient(145deg, rgba(18, 59, 110, 0.68), rgba(10, 30, 60, 0.9));
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-left: 3px solid var(--gold);
  border-radius: 6px 14px 14px 6px;
  padding: 18px 18px 16px;
  box-shadow: 3px 3px 0 rgba(18, 59, 110, 0.7), 7px 7px 0 rgba(10, 30, 60, 0.32), 12px 16px 28px rgba(0, 0, 0, 0.3);
}

.page-about .about-tl-card h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-tl-node-date {
  display: inline-block;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.72rem;
  line-height: 1;
  padding: 5px 10px 4px;
  border-radius: 999px;
  margin-right: 10px;
  vertical-align: middle;
  letter-spacing: 0.03em;
}

.page-about .about-tl-card p {
  font-family: var(--font-serif);
  line-height: 1.8;
  color: var(--silver);
  font-size: 0.94rem;
  margin: 0 0 10px;
}

.page-about .about-tl-detail {
  margin-top: 6px;
}

.page-about .about-tl-detail summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--electric);
  padding: 4px 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.3s ease;
}

.page-about .about-tl-detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-detail summary::before {
  content: "＋";
  display: inline-block;
  color: var(--gold);
  font-weight: 900;
  font-size: 0.95rem;
  line-height: 1;
  transition: transform 0.3s var(--ease);
}

.page-about .about-tl-detail[open] summary::before {
  content: "－";
  transform: rotate(180deg);
}

.page-about .about-tl-detail summary:hover,
.page-about .about-tl-detail summary:focus-visible {
  color: var(--champagne);
}

.page-about .about-tl-detail summary:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about .about-tl-detail ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl-detail li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--silver);
  line-height: 1.7;
  font-family: var(--font-sans);
}

.page-about .about-tl-detail li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--neon);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .about-tl-figure {
  margin: 28px 0 0;
  padding: 14px;
  background: linear-gradient(145deg, rgba(18, 59, 110, 0.3), rgba(10, 30, 60, 0.7));
  border: 1px solid rgba(212, 175, 55, 0.22);
  border-radius: 16px;
}

.page-about .about-tl-figure img,
.page-about .about-team-figure img,
.page-about .about-location-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  display: block;
  object-fit: cover;
}

.page-about .about-tl-figure img {
  border: 1px solid rgba(0, 229, 255, 0.12);
}

.page-about .about-tl-figure figcaption,
.page-about .about-team-figure figcaption,
.page-about .about-location-figure figcaption {
  margin-top: 10px;
  color: var(--silver);
  font-size: 0.85rem;
  font-family: var(--font-serif);
  font-style: italic;
  text-align: center;
  line-height: 1.6;
}

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

.page-about .about-service-card {
  position: relative;
  background: linear-gradient(145deg, rgba(18, 59, 110, 0.58), rgba(10, 30, 60, 0.86));
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-top: 3px solid var(--neon);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-service-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.32);
}

.page-about .about-service-card:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .about-service-card:nth-child(3) {
  border-top-color: var(--electric);
}

.page-about .about-service-icon {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--neon);
  display: block;
  margin-bottom: 12px;
}

.page-about .about-service-card:nth-child(2) .about-service-icon {
  color: var(--gold);
}

.page-about .about-service-card:nth-child(3) .about-service-icon {
  color: var(--electric);
}

.page-about .about-service-card h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-service-card p {
  font-family: var(--font-serif);
  line-height: 1.75;
  font-size: 0.94rem;
  color: var(--silver);
  margin: 0 0 10px;
}

.page-about .about-service-card ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 10px;
}

.page-about .about-service-card li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--silver);
  line-height: 1.7;
  font-family: var(--font-sans);
}

.page-about .about-service-card li::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 0.62rem;
  top: 5px;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team-card {
  position: relative;
  background: rgba(8, 22, 46, 0.7);
  border: 1px solid rgba(157, 78, 221, 0.26);
  border-radius: 12px;
  padding: 20px 20px 18px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-team-card:hover {
  border-color: rgba(157, 78, 221, 0.55);
  transform: translateY(-2px);
}

.page-about .about-team-index {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.8rem;
  color: var(--neon);
  border: 1px solid rgba(157, 78, 221, 0.5);
  border-radius: 4px;
  padding: 2px 8px;
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.page-about .about-team-card h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--champagne);
  margin: 0 0 8px;
}

.page-about .about-team-card p {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
}

.page-about .about-team-figure {
  margin: 26px 0 0;
  padding: 14px;
  background: linear-gradient(145deg, rgba(157, 78, 221, 0.12), rgba(10, 30, 60, 0.7));
  border: 1px solid rgba(157, 78, 221, 0.28);
  border-radius: 16px;
}

.page-about .about-team-figure img {
  border: 1px solid rgba(157, 78, 221, 0.2);
}

.page-about .about-ecosystem {
  margin-top: 26px;
  background: linear-gradient(145deg, rgba(18, 59, 110, 0.48), rgba(10, 30, 60, 0.82));
  border: 1px solid rgba(212, 175, 55, 0.24);
  border-left: 3px solid var(--gold);
  border-radius: 6px 14px 14px 6px;
  padding: 22px;
}

.page-about .about-ecosystem h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-ecosystem > p {
  font-family: var(--font-serif);
  color: var(--silver);
  line-height: 1.75;
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.page-about .about-ecosystem ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-ecosystem li {
  position: relative;
  padding-left: 22px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--silver);
  line-height: 1.75;
}

.page-about .about-ecosystem li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 0.8rem;
  top: 2px;
}

.page-about .about-ecosystem .stat-num {
  color: var(--gold);
  font-weight: 900;
  font-family: var(--font-sans);
  margin-right: 3px;
}

.page-about .about-location-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-location-info {
  background: linear-gradient(145deg, rgba(18, 59, 110, 0.55), rgba(10, 30, 60, 0.85));
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-radius: 14px;
  padding: 24px;
}

.page-about .about-location-info p {
  font-family: var(--font-sans);
  color: var(--silver);
  line-height: 1.8;
  font-size: 0.92rem;
  margin: 0 0 10px;
}

.page-about .about-location-info b {
  color: var(--champagne);
  font-weight: 700;
}

.page-about .about-location-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.page-about .about-location-note {
  font-family: var(--font-serif);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-location-figure {
  margin: 0;
  padding: 14px;
  background: linear-gradient(145deg, rgba(0, 229, 255, 0.08), rgba(10, 30, 60, 0.7));
  border: 1px solid rgba(0, 229, 255, 0.16);
  border-radius: 16px;
}

.page-about .about-location-figure img {
  border: 1px solid rgba(0, 229, 255, 0.12);
}

.page-about .about-note {
  margin-top: 48px;
  padding: 24px 26px;
  background: rgba(18, 59, 110, 0.5);
  border-left: 3px solid var(--electric);
  border-radius: 0 14px 14px 0;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
}

.page-about .about-note p {
  font-family: var(--font-serif);
  color: var(--silver);
  line-height: 1.9;
  margin: 0;
  font-size: 0.97rem;
}

.page-about .about-note a {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
  transition: color 0.3s ease, border-color 0.3s ease;
  margin: 0 2px;
}

.page-about .about-note a:hover {
  color: var(--champagne);
  border-bottom-color: var(--gold);
}

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

  .page-about .about-origin-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
  }

  .page-about .about-service-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-location-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (min-width: 768px) {
  .page-about .about-tl-item {
    padding-left: 36px;
  }

  .page-about .about-timeline::before,
  .page-about .about-tl-item::before {
    left: 10px;
  }

  .page-about .about-tl-card {
    padding: 20px 24px 18px;
  }

  .page-about .about-tl-card h3 {
    font-size: 1.15rem;
  }

  .page-about .about-hero {
    padding: 24px 0 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-origin-grid {
    gap: 56px;
  }

  .page-about .about-timeline {
    max-width: 980px;
  }

  .page-about .about-timeline::before,
  .page-about .about-tl-item::before {
    left: 12px;
  }

  .page-about .about-tl-item {
    padding-left: 42px;
  }

  .page-about .about-note {
    padding: 28px 32px;
  }
}