.page-about {
  --about-gold-grad: linear-gradient(135deg, #E8C87A 0%, #C9A84C 60%, #F5DE9C 100%);
  --about-gold-soft: rgba(232, 200, 122, 0.14);
  --about-gold-border: rgba(201, 168, 76, 0.32);
  --about-dark-card: rgba(255, 255, 255, 0.06);
  color: var(--color-ink);
  background: var(--color-body-bg);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 56px;
  color: var(--color-white);
  background: var(--color-space-900);
  border-bottom: 1px solid var(--about-gold-border);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  right: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 200, 122, 0.18) 0%, transparent 68%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 36px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .breadcrumb a {
  color: var(--color-gold-300);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  opacity: 0.78;
  outline: none;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .breadcrumb-sep {
  color: rgba(255, 255, 255, 0.35);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-title {
  margin: 8px 0 20px;
  font-family: var(--font-heading);
  font-size: 34px;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--color-white);
  max-width: 860px;
}

.page-about .about-hero-lead {
  max-width: 720px;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero-principles {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-principles span {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-gold-border);
  background: var(--about-gold-soft);
  color: var(--color-gold-300);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .about-stat-card {
  padding: 18px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--about-dark-card);
  text-align: center;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-white);
  white-space: nowrap;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-chapter-nav {
  position: sticky;
  top: var(--header-offset);
  z-index: 30;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(11, 30, 58, 0.06);
  box-shadow: 0 2px 12px rgba(11, 30, 58, 0.04);
}

.page-about .about-chapter-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-chapter-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-chapter-label {
  flex: 0 0 auto;
  margin-right: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

.page-about .about-chapter-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-chapter-link:hover,
.page-about .about-chapter-link:focus-visible {
  background: var(--color-body-bg);
  color: var(--color-space-500);
  outline: none;
}

.page-about .about-chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gold-500);
}

.page-about .about-section {
  padding: 64px 0;
}

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

.page-about .about-section-desc {
  max-width: 640px;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .about-cover-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-history {
  background: var(--color-body-bg);
}

.page-about .about-history-visual {
  margin-bottom: 48px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(11, 30, 58, 0.06);
}

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 19px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-gold-500), var(--color-space-500));
  opacity: 0.45;
  border-radius: var(--radius-pill);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 36px;
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline-num {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  background: var(--color-white);
  border: 2px solid var(--color-space-500);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-space-500);
  box-shadow: 0 2px 10px rgba(11, 30, 58, 0.08);
}

.page-about .about-timeline-content {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--color-white);
  border: 1px solid rgba(11, 30, 58, 0.06);
  box-shadow: var(--shadow-soft);
}

.page-about .about-timeline-content h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.4;
}

.page-about .about-timeline-content p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .about-values {
  position: relative;
  color: var(--color-white);
  background: var(--color-space-700);
  border-top: 1px solid rgba(201, 168, 76, 0.28);
  border-bottom: 1px solid rgba(201, 168, 76, 0.28);
}

.page-about .about-values .about-heading .section-title {
  color: var(--color-white);
}

.page-about .about-values .about-section-desc {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-values-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-principle-title {
  margin: 28px 0 10px;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-gold-300);
}

.page-about .about-principle-title:first-child {
  margin-top: 0;
}

.page-about .about-principle-list {
  margin: 0 0 8px;
  padding: 0;
  list-style: none;
}

.page-about .about-principle-list li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-principle-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-gold-500);
}

.page-about .about-values-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-capsule);
}

.page-about .about-boundary-card {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(11, 30, 58, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--about-gold-border);
}

.page-about .about-boundary-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-gold-300);
}

.page-about .about-boundary-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.84);
}

.page-about .about-network {
  background: var(--color-body-bg);
}

.page-about .about-network-visual {
  margin-bottom: 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(11, 30, 58, 0.06);
}

.page-about .about-network-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-network-card {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--color-white);
  border: 1px solid rgba(11, 30, 58, 0.06);
  box-shadow: var(--shadow-soft);
}

.page-about .about-network-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
}

.page-about .about-network-card p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .about-network-card .btn {
  margin-top: 10px;
}

.page-about .about-faq {
  color: var(--color-white);
  background: linear-gradient(160deg, var(--color-space-900) 0%, var(--color-space-700) 100%);
  border-top: 1px solid rgba(201, 168, 76, 0.28);
}

.page-about .about-faq .about-heading .section-title {
  color: var(--color-white);
}

.page-about .about-faq .about-section-desc {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-faq-list {
  display: grid;
  gap: 12px;
}

.page-about .about-faq-item {
  border-radius: var(--radius-md);
  background: var(--about-dark-card);
  border: 1px solid rgba(255, 255, 255, 0.09);
  overflow: hidden;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-faq-item[open] {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--about-gold-border);
}

.page-about .about-faq-item summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 54px 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-white);
  user-select: none;
}

.page-about .about-faq-item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-faq-item summary::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-gold-500);
}

.page-about .about-faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--about-gold-border);
  color: var(--color-gold-300);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.22s ease;
}

.page-about .about-faq-item[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

.page-about .about-faq-body {
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-faq-body p {
  margin: 0;
}

.page-about .about-faq-body a {
  color: var(--color-gold-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-faq-body a:hover {
  border-bottom-color: var(--color-gold-300);
}

.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal].is-revealed {
    animation: about-fade-in 0.6s ease both;
  }
}

@keyframes about-fade-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 48px;
    padding-bottom: 72px;
  }

  .page-about .about-title {
    font-size: 48px;
    line-height: 1.22;
  }

  .page-about .about-hero-lead {
    font-size: 18px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero-stats {
    grid-template-columns: 1fr;
    padding-top: 20px;
  }

  .page-about .about-stat-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 22px;
    text-align: left;
  }

  .page-about .about-section {
    padding: 88px 0;
  }

  .page-about .about-heading {
    margin-bottom: 44px;
  }

  .page-about .about-timeline-item {
    padding-left: 76px;
    padding-bottom: 44px;
  }

  .page-about .about-timeline-num {
    width: 46px;
    height: 46px;
    font-size: 13px;
  }

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

  .page-about .about-timeline-content h3 {
    font-size: 19px;
  }

  .page-about .about-values-grid {
    grid-template-columns: minmax(0, 1fr) 480px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-faq-item summary {
    font-size: 17px;
    padding-left: 24px;
  }

  .page-about .about-faq-body {
    padding-left: 24px;
    padding-right: 24px;
  }
}