.page-about {
  background: var(--ink);
  color: var(--cream);
  font-family: var(--body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-items: center;
  margin-bottom: 2.5rem;
  font-size: .88rem;
  color: var(--silver);
}

.page-about .breadcrumb-item a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(91, 192, 190, .35);
  transition: color .25s, border-color .25s;
}

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

.page-about .breadcrumb-sep {
  color: var(--silver);
}

.page-about .breadcrumb-current {
  color: var(--cream);
}

.page-about .about-hero {
  position: relative;
  padding: 4rem 0 4rem;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(240, 50, 140, .18), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--water) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "青漫水映";
  position: absolute;
  right: -2rem;
  top: 8%;
  font-family: var(--display);
  font-size: clamp(6rem, 20vw, 20rem);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(240, 50, 140, .35);
  letter-spacing: -.04em;
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "357";
  position: absolute;
  left: -1rem;
  bottom: 2rem;
  font-family: var(--data);
  font-size: clamp(8rem, 24vw, 22rem);
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 2px rgba(91, 192, 190, .25);
  line-height: 1;
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero-grid {
  display: flex;
  flex-direction: column;
  gap: 3.2rem;
}

.page-about .hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: rgba(8, 28, 52, .5);
  border: 1px solid rgba(245, 235, 215, .18);
  border-radius: 999px;
  padding: .55rem 1rem;
  margin-bottom: 1.5rem;
  font-size: .88rem;
  letter-spacing: .02em;
  color: var(--cream);
}

.page-about .hero-copy h1 {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 4.8rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 0 0 1.4rem;
  color: var(--cream);
}

.page-about .hero-title-sub {
  display: block;
  font-size: .52em;
  color: var(--magenta);
  margin-top: .35em;
  letter-spacing: .02em;
}

.page-about .hero-lead {
  max-width: 58ch;
  font-size: 1.06rem;
  line-height: 1.9;
  color: rgba(253, 247, 239, .8);
  margin: 0 0 2.2rem;
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 1.8rem;
  margin-bottom: 2.4rem;
}

.page-about .hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.page-about .hero-meta-label {
  font-size: .7rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: .14em;
  font-family: var(--data);
}

.page-about .hero-meta-item strong {
  font-family: var(--data);
  font-size: 1.05rem;
  color: var(--cream);
}

.page-about .hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .hero-visual {
  position: relative;
  margin: 0;
}

.page-about .hero-visual-frame {
  position: relative;
  max-width: 30rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
  transform: rotate(1.4deg);
  transition: transform .6s var(--ease);
}

.page-about .hero-visual:hover .hero-visual-frame {
  transform: rotate(0deg) scale(1.02);
}

.page-about .hero-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .hero-visual-caption {
  margin-top: .75rem;
  margin-left: .75rem;
  font-size: .85rem;
  color: var(--silver);
}

.page-about .as-chapter {
  position: relative;
  padding: 4rem 0;
  background: var(--ink);
}

.page-about .as-chapter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
  position: relative;
  z-index: 1;
}

.page-about .as-chapter-main {
  background: rgba(253, 247, 239, .03);
  border: 1px solid rgba(253, 247, 239, .08);
  border-radius: var(--radius);
  padding: 2rem 1.6rem;
  position: relative;
}

.page-about .as-chapter-shade {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(110deg, rgba(91, 192, 190, .1) 0%, rgba(240, 50, 140, .06) 50%, transparent 72%);
  clip-path: polygon(55% 0, 100% 0, 100% 100%, 28% 100%);
}

.page-about .as-chapter-shade-right {
  clip-path: polygon(0 0, 45% 0, 100% 100%, 0 100%);
  background: linear-gradient(-115deg, rgba(245, 184, 65, .1) 0%, rgba(245, 184, 65, 0) 45%);
}

.page-about .as-chapter-naming {
  background:
    radial-gradient(700px 300px at 90% 10%, rgba(240, 50, 140, .12), transparent 60%),
    linear-gradient(180deg, var(--ink), var(--water) 120%);
}

.page-about .as-chapter-upgrade {
  background:
    radial-gradient(700px 300px at 10% 20%, rgba(91, 192, 190, .1), transparent 60%),
    linear-gradient(180deg, var(--ink), var(--water) 130%);
}

.page-about .as-chapter-catalog {
  background:
    radial-gradient(700px 300px at 80% 0%, rgba(240, 50, 140, .12), transparent 60%),
    var(--paper);
  color: var(--ink);
}

.page-about .as-chapter-catalog .as-chapter-main {
  background: rgba(253, 247, 239, .6);
  border-color: rgba(8, 28, 52, .12);
}

.page-about .as-chapter-compliance {
  background:
    radial-gradient(700px 400px at 0% 100%, rgba(245, 184, 65, .12), transparent 60%),
    linear-gradient(180deg, var(--water), var(--ink) 70%);
}

.page-about .as-chapter-compliance .as-chapter-main {
  background: linear-gradient(135deg, rgba(14, 58, 110, .4), rgba(8, 28, 52, .6));
  border-color: rgba(245, 184, 65, .3);
}

.page-about .as-depth {
  display: flex;
  align-items: center;
  gap: .7rem;
}

.page-about .as-depth-line {
  width: 3.2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  display: inline-block;
}

.page-about .as-depth-num {
  font-family: var(--data);
  font-size: 1rem;
  font-weight: 700;
  color: var(--gold);
  transform: skewX(-12deg);
}

.page-about .as-depth-unit {
  font-size: .7rem;
  color: var(--silver);
  font-family: var(--data);
}

.page-about .as-chapter-head {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  margin-bottom: 1.3rem;
}

.page-about .section-index {
  font-family: var(--data);
  font-size: .78rem;
  letter-spacing: .22em;
  color: var(--magenta);
}

.page-about .as-chapter-head h2 {
  font-family: var(--display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  margin: 0;
  letter-spacing: -.01em;
}

.page-about .as-chapter-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(253, 247, 239, .78);
  margin: 0 0 1.8rem;
  max-width: 70ch;
}

.page-about .as-chapter-catalog .as-chapter-lead {
  color: rgba(21, 24, 30, .7);
}

.page-about .as-chapter-catalog .section-index {
  color: var(--magenta);
}

.page-about .as-chapter-catalog h2 {
  color: var(--ink);
}

.page-about .as-copy-grid {
  display: grid;
  gap: 1.2rem;
  font-size: .97rem;
  line-height: 1.85;
  color: rgba(253, 247, 239, .78);
}

.page-about .as-copy-grid p {
  margin: 0;
}

.page-about .as-note {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.4rem;
  padding: .9rem 1.1rem;
  background: rgba(255, 255, 255, .05);
  border-left: 3px solid var(--magenta);
}

.page-about .as-note-label {
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--cyan);
  font-family: var(--data);
}

.page-about .as-note-text {
  font-weight: 700;
  color: var(--gold);
}

.page-about .as-upgrade-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem 1.6rem;
  margin: 2rem 0;
}

.page-about .as-upgrade-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.2rem;
  background: rgba(255, 255, 255, .03);
  border: 1px solid rgba(253, 247, 239, .07);
  border-radius: var(--radius);
  transition: border-color .3s var(--ease), transform .3s var(--ease), background .3s var(--ease);
}

.page-about .as-upgrade-item:hover {
  transform: translateY(-3px);
  border-color: rgba(240, 50, 140, .4);
  background: rgba(255, 255, 255, .05);
}

.page-about .as-upgrade-num {
  font-family: var(--data);
  font-weight: 700;
  color: var(--magenta);
  font-size: 1.1rem;
  line-height: 1.4;
}

.page-about .as-upgrade-item h3 {
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 .35rem;
  color: var(--cream);
}

.page-about .as-upgrade-item p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: rgba(253, 247, 239, .66);
}

.page-about .as-evolution-figure {
  margin: 2.5rem 0 0;
}

.page-about .as-evolution-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(253, 247, 239, .1);
  box-shadow: var(--shadow);
}

.page-about .as-evolution-figure figcaption {
  margin-top: .6rem;
  font-size: .8rem;
  color: var(--silver);
  text-align: right;
}

.page-about .as-wave-divider {
  background: var(--ink);
  line-height: 0;
  height: 60px;
  position: relative;
  top: -1px;
  z-index: 0;
}

.page-about .as-wave-divider svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-about .as-wave-divider-to-ink {
  background: var(--paper);
}

.page-about .as-wave-divider-to-paper {
  background: var(--paper);
}

.page-about .as-catalog-list {
  margin: 1.6rem 0;
}

.page-about .as-cat {
  background: rgba(255, 255, 255, .5);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(8, 28, 52, .06);
  transition: border-color .35s ease, background .35s ease, box-shadow .35s ease;
}

.page-about .as-cat[open] {
  border-left-color: var(--magenta);
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 10px 30px rgba(8, 28, 52, .1);
}

.page-about .as-cat summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .8rem 1rem;
  padding: 1.2rem 1.3rem;
  cursor: pointer;
  list-style: none;
}

.page-about .as-cat summary::-webkit-details-marker {
  display: none;
}

.page-about .as-cat-index {
  font-family: var(--data);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyan);
  transition: color .3s;
}

.page-about .as-cat[open] .as-cat-index {
  color: var(--magenta);
}

.page-about .as-cat-name {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--ink);
  flex: 1 1 9rem;
}

.page-about .as-cat-status {
  font-size: .78rem;
  color: rgba(21, 24, 30, .55);
  background: rgba(8, 28, 52, .05);
  border-radius: 999px;
  padding: .3rem .8rem;
}

.page-about .as-cat-toggle {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--magenta);
  line-height: 1;
  transition: transform .35s var(--ease);
}

.page-about .as-cat[open] .as-cat-toggle {
  transform: rotate(45deg);
}

.page-about .as-cat-body {
  padding: 0 1.3rem 1.3rem calc(1rem + 3.2rem);
  color: rgba(21, 24, 30, .72);
  font-size: .95rem;
  line-height: 1.8;
}

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

.page-about .as-catalog-note {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
  font-size: .9rem;
  color: rgba(21, 24, 30, .6);
  background: rgba(8, 28, 52, .04);
  border: 1px dashed rgba(8, 28, 52, .18);
  border-radius: var(--radius);
  padding: .9rem 1rem;
  line-height: 1.7;
}

.page-about .as-catalog-note-icon {
  color: var(--magenta);
  font-weight: 900;
  line-height: 1;
}

.page-about .as-compliance-grid {
  display: grid;
  gap: 2.2rem;
  align-items: center;
}

.page-about .as-compliance-copy > p {
  color: rgba(253, 247, 239, .78);
  line-height: 1.85;
  margin: 0 0 1.2rem;
}

.page-about .as-fact-list {
  display: grid;
  gap: .8rem;
  margin: 1.8rem 0;
}

.page-about .as-fact {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1rem;
  padding: .85rem 0;
  border-top: 1px solid rgba(253, 247, 239, .1);
}

.page-about .as-fact-key {
  font-family: var(--data);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--cyan);
  padding-top: .15rem;
}

.page-about .as-fact-value {
  color: var(--cream);
  font-size: .95rem;
  word-break: break-word;
  line-height: 1.7;
}

.page-about .as-compliance-note {
  font-size: .85rem;
  color: var(--silver);
  line-height: 1.7;
}

.page-about .as-compliance-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.8rem;
}

.page-about .as-compliance-links .btn-outline {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .as-compliance-links .btn-outline:hover {
  background: rgba(245, 184, 65, .15);
}

.page-about .as-compliance-links .btn-ghost {
  color: var(--cyan);
}

.page-about .as-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 2.6rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(253, 247, 239, .14);
}

.page-about .as-next-links a {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 700;
  font-size: .95rem;
  border-bottom: 1px solid rgba(91, 192, 190, .4);
  transition: color .25s, border-color .25s;
}

.page-about .as-next-links a:hover {
  color: var(--magenta);
  border-bottom-color: var(--magenta);
}

.page-about .as-compliance-visual {
  position: relative;
  margin: 0;
}

.page-about .as-compliance-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(245, 184, 65, .25);
  box-shadow: var(--shadow);
}

.page-about .as-compliance-caption {
  margin-top: .6rem;
  font-size: .8rem;
  color: var(--silver);
}

.page-about .as-stamp {
  position: absolute;
  top: 8%;
  right: 6%;
  width: 8rem;
  height: 8rem;
  border-radius: 50%;
  border: 3px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  z-index: 2;
  box-shadow: 0 0 0 8px rgba(245, 184, 65, .16), 0 0 40px rgba(245, 184, 65, .25);
  background: rgba(8, 28, 52, .5);
  backdrop-filter: blur(2px);
}

.page-about .as-stamp-text {
  font-family: var(--data);
  font-size: .72rem;
  line-height: 1.4;
  color: var(--gold);
  font-weight: 600;
}

.page-about .as-stamp-ring {
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(245, 184, 65, .55);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .as-stamp.is-revealed {
  animation: asStampIn 1.2s var(--ease) both;
}

@keyframes asStampIn {
  from {
    opacity: 0;
    transform: rotate(-18deg) scale(.78);
  }
  to {
    opacity: 1;
    transform: rotate(0deg) scale(1);
  }
}

@media (min-width: 600px) {
  .page-about .as-upgrade-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .as-fact {
    grid-template-columns: 6rem 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 6rem 0 5rem;
  }

  .page-about .about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 4rem;
    align-items: center;
  }

  .page-about .hero-visual-frame {
    max-width: 100%;
  }

  .page-about .as-chapter {
    padding: 7rem 0;
  }

  .page-about .as-chapter-grid {
    grid-template-columns: 6rem minmax(0, 1fr);
    gap: 0 3.5rem;
  }

  .page-about .as-chapter-main {
    padding: 3rem 3.2rem;
  }

  .page-about .as-depth {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: .85rem;
    position: relative;
  }

  .page-about .as-depth-line {
    width: 2px;
    flex: 1;
    min-height: 5rem;
    background: linear-gradient(180deg, var(--cyan) 0%, var(--magenta) 60%, var(--gold) 100%);
  }

  .page-about .as-depth-num {
    font-size: 2.2rem;
    line-height: 1;
  }

  .page-about .as-copy-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .page-about .as-note {
    margin-top: 2rem;
  }

  .page-about .as-wave-divider {
    height: 100px;
  }

  .page-about .as-compliance-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 4rem;
  }

  .page-about .as-stamp {
    width: 9.5rem;
    height: 9.5rem;
  }

  .page-about .as-stamp-text {
    font-size: .8rem;
  }
}