.page-about {
  --abt-gold-deep: #b8912e;
  --abt-gold-soft: rgba(212, 175, 55, 0.18);
  --abt-panel-glass: rgba(30, 58, 95, 0.42);
  --abt-line-soft: rgba(61, 90, 128, 0.55);
  --abt-serif: "Playfair Display", "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --abt-mono: "Roboto Mono", "SF Mono", Consolas, monospace;
  color: var(--c-text);
  background:
    radial-gradient(ellipse at 88% 8%, rgba(212, 175, 55, 0.10), transparent 32rem),
    radial-gradient(circle at 8% 42%, rgba(46, 139, 87, 0.08), transparent 26rem),
    linear-gradient(180deg, #081627 0%, #0B1F3A 38%, #102A4A 100%);
  scroll-behavior: smooth;
}

.page-about .container {
  width: min(1200px, 100% - 32px);
  margin-inline: auto;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--abt-serif);
}

.page-about h1 {
  font-size: clamp(2.35rem, 6vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: 0.02em;
}

.page-about h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  line-height: 1.2;
}

.page-about h3 {
  font-size: 1.12rem;
  line-height: 1.4;
  color: var(--c-gold-light);
}

.page-about a {
  color: var(--c-gold);
  text-decoration: none;
}

.page-about a:focus-visible {
  outline: 2px solid var(--c-data);
  outline-offset: 4px;
  border-radius: 2px;
}

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

.page-about .abt-breadcrumb {
  position: relative;
  z-index: 4;
  max-width: 1200px;
  margin-inline: auto;
  padding: 18px 16px 0;
  font-family: var(--abt-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-about .abt-breadcrumb a {
  color: var(--c-gold);
}

.page-about .abt-crumb-sep {
  margin: 0 0.6rem;
  color: var(--c-line);
}

.page-about .abt-hero {
  position: relative;
  padding: 60px 0 0;
  overflow: hidden;
}

.page-about .abt-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .abt-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.26;
  filter: saturate(0.9) contrast(1.1);
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.2) 72%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.2) 72%, transparent 100%);
}

.page-about .abt-hero-inner {
  position: relative;
  z-index: 2;
  padding: 34px 16px 30px;
}

.page-about .abt-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--abt-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .abt-kicker-line {
  width: 44px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}

.page-about .abt-hero-title {
  position: relative;
  max-width: 980px;
  color: var(--c-gold-light);
  text-shadow: 0 2px 26px rgba(212, 175, 55, 0.24);
}

.page-about .abt-hero-title::after {
  content: "";
  display: block;
  width: 96px;
  height: 1px;
  margin-top: 26px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-emerald), transparent);
}

.page-about .abt-hero-desc {
  max-width: 760px;
  margin-top: 18px;
  font-size: clamp(0.95rem, 1.8vw, 1.08rem);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .abt-hero-link {
  display: inline-flex;
  margin-top: 26px;
  padding: 12px 24px;
  border: 1px solid var(--c-gold);
  color: var(--c-gold-light);
  border-radius: 2px;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  font-family: var(--abt-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  transition: background 0.25s ease, color 0.25s ease;
}

.page-about .abt-hero-link:hover {
  background: var(--abt-gold-soft);
  color: var(--c-gold-light);
}

.page-about .abt-metrics-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 0 16px 70px;
}

.page-about .abt-metric-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: linear-gradient(142deg, rgba(30, 58, 95, 0.78), rgba(11, 31, 58, 0.55));
  border: 1px solid var(--abt-line-soft);
  border-radius: 3px;
  box-shadow: var(--shadow);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-about .abt-metric-num {
  font-family: var(--abt-mono);
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  font-weight: 500;
  color: var(--c-gold);
  line-height: 1;
}

.page-about .abt-metric-num em {
  font-size: 0.6em;
  font-style: normal;
  color: var(--c-data);
}

.page-about .abt-metric-label {
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--c-muted);
}

.page-about .abt-section {
  position: relative;
  padding: 80px 0;
  scroll-margin-top: 60px;
}

.page-about .abt-section + .abt-section {
  border-top: 1px solid rgba(61, 90, 128, 0.32);
}

.page-about .abt-section-bg-num {
  position: absolute;
  top: 10px;
  right: 10px;
  font-family: var(--abt-serif);
  font-size: clamp(5.5rem, 18vw, 11rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(212, 175, 55, 0.12);
  pointer-events: none;
  z-index: 0;
}

.page-about .abt-section-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-inline: 16px;
}

.page-about .abt-side-index {
  display: none;
}

.page-about .abt-section-body {
  min-width: 0;
}

.page-about .section-index {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .section-index .index-num {
  font-family: var(--abt-serif);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 0.9;
  color: var(--c-gold);
  letter-spacing: -0.04em;
}

.page-about .section-index .index-title {
  font-family: var(--abt-serif);
  font-size: clamp(1.55rem, 3.4vw, 2.2rem);
  color: var(--c-gold-light);
  letter-spacing: 0.02em;
}

.page-about .section-index .index-title::after {
  content: "";
  display: inline-block;
  width: 32px;
  height: 1px;
  margin-left: 16px;
  vertical-align: middle;
  background: var(--c-emerald);
}

.page-about .abt-lead {
  font-size: clamp(1rem, 2vw, 1.14rem);
  line-height: 1.85;
  color: var(--c-text);
  margin-bottom: 20px;
}

.page-about .abt-section-desc {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 760px;
  margin-bottom: 24px;
}

.page-about .abt-brand-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 28px 0;
}

.page-about .abt-brand-facts > div,
.page-about .abt-gov-step {
  padding: 22px 20px;
  background: linear-gradient(148deg, var(--abt-panel-glass), rgba(11, 31, 58, 0.25));
  border: 1px solid var(--abt-line-soft);
  border-radius: 3px;
}

.page-about .abt-brand-facts p,
.page-about .abt-gov-step p {
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .abt-timeline-visual {
  margin: 26px 0 8px;
  border: 1px solid rgba(61, 90, 128, 0.4);
  border-radius: 3px;
  overflow: hidden;
  background: #0d223d;
}

.page-about .abt-timeline-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .abt-timeline-list {
  list-style: none;
  margin-top: 26px;
  padding: 0 0 0 18px;
  border-left: 1px solid rgba(212, 175, 55, 0.42);
}

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

.page-about .abt-timeline-item::before {
  content: "";
  position: absolute;
  left: -23.5px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
}

.page-about .abt-timeline-item + .abt-timeline-item {
  margin-top: 0;
}

.page-about .abt-timeline-detail {
  position: relative;
  padding: 14px 0;
  border: 0;
  border-bottom: 1px dashed rgba(61, 90, 128, 0.34);
}

.page-about .abt-timeline-detail summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
}

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

.page-about .abt-timeline-detail summary::before {
  content: "＋";
  font-family: var(--abt-mono);
  color: var(--c-data);
  margin-right: 2px;
  font-size: 0.85rem;
}

.page-about .abt-timeline-detail[open] summary::before {
  content: "－";
}

.page-about .abt-timeline-year {
  font-family: var(--abt-mono);
  font-size: 0.9rem;
  color: var(--c-gold);
  letter-spacing: 0.06em;
}

.page-about .abt-timeline-title {
  font-family: var(--abt-serif);
  font-size: 1.12rem;
  color: var(--c-text);
}

.page-about .abt-timeline-detail p {
  margin-top: 8px;
  padding-left: 24px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 720px;
}

.page-about .abt-table-wrap {
  margin: 24px 0 14px;
  background: rgba(11, 31, 58, 0.5);
  border: 1px solid var(--abt-line-soft);
  border-radius: 3px;
  overflow-x: auto;
}

.page-about .abt-version-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.page-about .abt-version-table caption {
  text-align: left;
  padding: 14px 16px;
  font-family: var(--abt-mono);
  font-size: 0.76rem;
  color: var(--c-muted);
  letter-spacing: 0.06em;
}

.page-about .abt-version-table th,
.page-about .abt-version-table td {
  padding: 13px 16px;
  text-align: left;
  border-top: 1px solid rgba(61, 90, 128, 0.32);
  color: var(--c-text);
  line-height: 1.5;
}

.page-about .abt-version-table th {
  background: rgba(30, 58, 95, 0.6);
  color: var(--c-gold-light);
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .abt-version-table td:first-child {
  font-family: var(--abt-mono);
  color: var(--c-gold);
  white-space: nowrap;
}

.page-about .abt-table-note {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--c-muted);
  margin-bottom: 18px;
}

.page-about .abt-culture-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 24px;
}

.page-about .abt-culture-art {
  position: relative;
  max-width: 500px;
  margin-inline: auto;
  width: 100%;
  border: 1px solid rgba(61, 90, 128, 0.44);
  border-radius: 3px;
  overflow: hidden;
  background: #0d223d;
}

.page-about .abt-culture-art img {
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .abt-drum-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  justify-self: center;
  align-self: center;
  animation: abt-drum-spin 48s linear infinite;
  transform-origin: center;
  mix-blend-mode: screen;
}

@keyframes abt-drum-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .abt-drum-svg {
    animation: none;
  }
}

.page-about .abt-culture-text p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--c-text);
  margin-bottom: 14px;
}

.page-about .abt-culture-text p:last-of-type {
  color: var(--c-muted);
}

.page-about .abt-culture-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  padding: 0;
}

.page-about .abt-culture-tags li {
  padding: 7px 12px;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--c-gold-light);
  letter-spacing: 0.02em;
}

.page-about .abt-gov-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 24px 0 20px;
}

.page-about .abt-gov-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--c-emerald);
  border-radius: 2px;
  font-family: var(--abt-mono);
  font-size: 0.9rem;
  color: var(--c-emerald);
  margin-bottom: 12px;
}

.page-about .abt-record-visual {
  margin-bottom: 30px;
  border: 1px solid rgba(61, 90, 128, 0.4);
  border-radius: 3px;
  overflow: hidden;
  background: #0d223d;
}

.page-about .abt-record-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .abt-mission-footer {
  margin-top: 30px;
  padding: 22px 20px;
  border-left: 3px solid var(--c-gold);
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), transparent 60%);
}

.page-about .abt-signature {
  display: block;
  font-family: var(--abt-serif);
  font-size: 1.02rem;
  color: var(--c-gold-light);
  letter-spacing: 0.14em;
}

.page-about .abt-trust {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .abt-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--abt-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--c-gold);
  transition: gap 0.2s ease;
}

.page-about .abt-inline-link:hover {
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about .abt-metrics-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-bottom: 80px;
  }

  .page-about .abt-brand-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .abt-gov-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .abt-hero-inner {
    padding: 70px 16px 44px;
  }

  .page-about .abt-hero-title {
    max-width: 820px;
  }

  .page-about .abt-section {
    padding: 110px 0;
  }

  .page-about .abt-section-grid {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 40px 48px;
  }

  .page-about .abt-side-index {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    padding-top: 14px;
  }

  .page-about .abt-side-index .index-num {
    font-family: var(--abt-serif);
    font-size: 4.4rem;
    font-weight: 700;
    line-height: 0.8;
    color: var(--c-gold);
    letter-spacing: -0.06em;
  }

  .page-about .abt-side-index .index-title {
    font-family: var(--abt-serif);
    font-size: 1.3rem;
    color: var(--c-gold-light);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.2em;
    padding-right: 6px;
  }

  .page-about .abt-vertical-note {
    writing-mode: vertical-rl;
    font-family: var(--abt-mono);
    font-size: 0.68rem;
    letter-spacing: 0.24em;
    color: var(--c-muted);
    text-transform: uppercase;
  }

  .page-about .section-index {
    margin-bottom: 24px;
  }

  .page-about .abt-culture-wrap {
    grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
    align-items: center;
    gap: 36px;
  }

  .page-about .abt-culture-art {
    margin-inline: 0;
  }
}

@media (min-width: 1200px) {
  .page-about .container,
  .page-about .abt-breadcrumb {
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .abt-metrics-grid {
    padding-inline: 0;
  }
}