.page-about {
  --ab-line-gold: rgba(232, 182, 43, 0.28);
  --ab-grid-line: rgba(11, 59, 45, 0.06);
  --ab-grid-gold: rgba(248, 213, 104, 0.14);
  background-color: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
  font-family: var(--font-body);
  line-height: 1.7;
}

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

.page-about .ab-hero,
.page-about .ab-section {
  scroll-margin-top: 110px;
}

.page-about .ab-hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 90% 10%, rgba(20, 106, 75, 0.72) 0%, rgba(11, 59, 45, 0.98) 60%),
    linear-gradient(135deg, var(--deep-pitch) 0%, #0A2E24 100%);
  border-radius: 0 0 48px 48px;
  padding: 120px 0 36px;
  color: #F5F1E6;
  box-shadow: var(--shadow-capsule);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(232, 182, 43, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 182, 43, 0.08) 1px, transparent 1px);
  background-size: 28px 28px;
}

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

.page-about .ab-hero .breadcrumb {
  margin: 0 0 28px;
}

.page-about .ab-hero .breadcrumb a {
  color: rgba(243, 240, 230, 0.82);
  text-decoration: none;
}

.page-about .ab-hero .breadcrumb a:hover {
  color: var(--gold-light);
}

.page-about .ab-hero-layout {
  display: grid;
  gap: 32px;
}

.page-about .ab-hero-main {
  max-width: 720px;
}

.page-about .section-label {
  color: var(--gold-primary);
}

.page-about .ab-hero .section-label {
  color: var(--gold-light);
}

.page-about .ab-page-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: #ffffff;
  margin: 12px 0 0;
}

.page-about .ab-hero-lead {
  max-width: 660px;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  color: rgba(243, 240, 230, 0.92);
  margin: 18px 0 0;
}

.page-about .ab-hero-lead strong {
  color: var(--gold-light);
  font-weight: 700;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .ab-hero .btn-ghost {
  border: 1px solid rgba(243, 240, 230, 0.52);
  color: #F3F0E6;
  background: rgba(11, 59, 45, 0.38);
}

.page-about .ab-hero-meta dl {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(232, 182, 43, 0.28);
  border-radius: 22px;
  backdrop-filter: blur(6px);
}

.page-about .ab-hero-meta dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold-light);
  letter-spacing: 0.14em;
}

.page-about .ab-hero-meta dd {
  margin: 4px 0 0;
  font-weight: 600;
  color: #F3F0E6;
  font-size: 0.95rem;
}

.page-about .ab-coord-band {
  margin-top: 44px;
  border-top: 1px solid var(--ab-line-gold);
  height: 48px;
  background-image:
    linear-gradient(rgba(248, 213, 104, 0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(248, 213, 104, 0.10) 1px, transparent 1px);
  background-size: 24px 24px;
  border-radius: 0 0 18px 18px;
}

.page-about .ab-coord-svg {
  width: 100%;
  height: 48px;
  display: block;
}

.page-about .ab-section {
  padding: 64px 0 72px;
}

.page-about .ab-section-layout {
  display: grid;
  gap: 24px;
}

.page-about .ab-index-col {
  position: relative;
  padding-left: 20px;
  border-left: 2px solid var(--gold-primary);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-index-label {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 4px 0 0;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .ab-index-scale {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--pitch-green);
  letter-spacing: 0.08em;
}

.page-about .ab-content-heading {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 3rem);
  line-height: 1.15;
  margin: 0 0 22px;
  letter-spacing: 0.01em;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-content-lead {
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(18, 28, 24, 0.82);
  margin: 0 0 28px;
  max-width: 780px;
}

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

.page-about .ab-plan-card {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--mist);
  border-left: 4px solid var(--gold-primary);
  border-radius: 16px;
  padding: 22px 22px 20px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition);
}

.page-about .ab-plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--gold-primary);
}

.page-about .ab-plan-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gold-primary);
  letter-spacing: 0.1em;
}

.page-about .ab-plan-card h3 {
  font-size: 1.05rem;
  margin: 6px 0 6px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-plan-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(18, 28, 24, 0.78);
}

.page-about .ab-section--deep {
  background:
    radial-gradient(80% 100% at 10% 0%, rgba(20, 106, 75, 0.85), rgba(11, 59, 45, 0.98));
  color: #F3F0E6;
}

.page-about .ab-section--deep .ab-index-label {
  color: #F3F0E6;
}

.page-about .ab-section--deep .ab-index-scale {
  color: var(--gold-light);
}

.page-about .ab-section--deep .ab-content-heading {
  color: #ffffff;
}

.page-about .ab-section--deep .ab-content-lead {
  color: rgba(243, 240, 230, 0.90);
}

.page-about .ab-sync-layout {
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .ab-sync-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-sync-steps li {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(232, 182, 43, 0.18);
}

.page-about .ab-sync-steps li:last-child {
  border-bottom: 0;
}

.page-about .ab-step-num {
  font-family: var(--font-mono);
  color: var(--gold-light);
  font-size: 0.9rem;
  flex: 0 0 32px;
  margin-top: 6px;
}

.page-about .ab-sync-steps h3 {
  color: #ffffff;
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .ab-sync-steps p {
  color: rgba(243, 240, 230, 0.78);
  font-size: 0.92rem;
  margin: 0;
}

.page-about .ab-sync-figure,
.page-about .ab-venue-figure,
.page-about .ab-timeline-figure {
  margin: 0;
}

.page-about .ab-sync-figure img {
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
  width: 100%;
  height: auto;
}

.page-about .ab-more-link {
  margin-top: 24px;
}

.page-about .ab-more-link a {
  color: var(--gold-light);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(232, 182, 43, 0.35);
  padding-bottom: 2px;
}

.page-about .ab-more-link a:hover {
  color: #ffffff;
  border-color: var(--gold-light);
}

.page-about .ab-venue-layout {
  display: grid;
  gap: 28px;
}

.page-about .ab-venue-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-venue-list li {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--mist);
  border-radius: 14px;
  padding: 14px 18px;
  font-size: 0.94rem;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: rgba(18, 28, 24, 0.86);
}

.page-about .ab-venue-list li::before {
  content: "—";
  color: var(--gold-primary);
  font-weight: 700;
}

.page-about .ab-venue-figure img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: var(--shadow-card);
}

.page-about .ab-section--gold {
  background:
    radial-gradient(80% 100% at 90% 0%, rgba(232, 182, 43, 0.14) 0%, rgba(243, 240, 230, 0.4) 70%),
    var(--paper);
}

.page-about .ab-version-row {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-version-card {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--mist);
  border-left: 4px solid var(--gold-primary);
  border-radius: 16px;
  padding: 0 16px;
  backdrop-filter: blur(4px);
}

.page-about .ab-version-card summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
}

.page-about .ab-version-card summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-version-card[open] summary {
  border-bottom: 1px dashed var(--mist);
  margin-bottom: 0;
}

.page-about .ab-version-card div {
  padding: 14px 0 16px;
  font-size: 0.93rem;
  color: rgba(18, 28, 24, 0.78);
}

.page-about .ab-toggle-mark {
  position: relative;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border-radius: 50%;
  border: 1px solid var(--gold-primary);
}

.page-about .ab-toggle-mark::before,
.page-about .ab-toggle-mark::after {
  content: "";
  position: absolute;
  background: var(--gold-primary);
}

.page-about .ab-toggle-mark::before {
  width: 10px;
  height: 2px;
  top: 9px;
  left: 5px;
}

.page-about .ab-toggle-mark::after {
  width: 2px;
  height: 10px;
  top: 5px;
  left: 9px;
}

.page-about .ab-version-card[open] .ab-toggle-mark::after {
  display: none;
}

.page-about .ab-timeline-section {
  background: var(--deep-pitch);
  color: #F3F0E6;
}

.page-about .ab-timeline-section .ab-index-label {
  color: #F3F0E6;
}

.page-about .ab-timeline-section .ab-index-scale {
  color: var(--gold-light);
}

.page-about .ab-timeline-section .ab-content-heading {
  color: #ffffff;
}

.page-about .ab-timeline-section .ab-content-lead {
  color: rgba(243, 240, 230, 0.82);
}

.page-about .ab-timeline-figure {
  margin-bottom: 36px;
}

.page-about .ab-timeline-figure img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 0;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--gold-primary), rgba(232, 182, 43, 0.15));
}

.page-about .ab-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

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

.page-about .ab-timeline-mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--gold-primary);
  background: var(--deep-pitch);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.page-about .ab-timeline-body {
  background: rgba(243, 240, 230, 0.04);
  border: 1px solid rgba(232, 182, 43, 0.16);
  border-radius: 18px;
  padding: 18px 20px;
}

.page-about .ab-timeline-tag {
  display: inline-flex;
  background: var(--gold-mist);
  color: var(--gold-light);
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 2px 10px;
  margin-bottom: 8px;
}

.page-about .ab-timeline-body h3 {
  color: #ffffff;
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .ab-timeline-body p {
  color: rgba(243, 240, 230, 0.78);
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .ab-section :focus-visible {
  outline: 2px solid var(--gold-primary);
  outline-offset: 2px;
}

@media (min-width: 760px) {
  .page-about .ab-plan-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-version-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero {
    padding: 150px 0 48px;
    border-radius: 0 0 56px 56px;
  }

  .page-about .ab-hero-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .ab-section {
    padding: 88px 0 104px;
  }

  .page-about .ab-section-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .ab-sync-layout {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 40px;
    align-items: center;
  }

  .page-about .ab-venue-layout {
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 40px;
    align-items: center;
  }

  .page-about .ab-timeline::before {
    left: 120px;
  }

  .page-about .ab-timeline-item {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .ab-timeline-mark {
    margin-left: 98px;
  }
}