.page-about {
  --about-paper: var(--paper-bg);
  --about-dot: rgba(178, 220, 255, 0.16);
  color: var(--text-primary);
  background: var(--bg-deep);
  overflow-x: clip;
  padding-top: 18px;
}

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

.page-about .yx-breadcrumb {
  margin: 0 0 36px;
}

.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 220px;
  background-image: radial-gradient(var(--about-dot) 1px, transparent 1px);
  background-size: 16px 16px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 90%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 90%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-kicker {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--brand);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 2.4rem;
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.page-about .about-hero-lead {
  margin: 0 0 20px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
  max-width: 42em;
}

.page-about .about-hero-lead strong {
  color: var(--accent);
  font-family: var(--font-data);
  font-weight: 400;
}

.page-about .about-hero-meta {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero-meta li {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 7px 11px;
  background: var(--bg-panel);
  border-radius: var(--radius);
}

.page-about .about-origin,
.page-about .about-timeline,
.page-about .about-quality,
.page-about .about-mission {
  padding: 48px 0;
}

.page-about .about-section-head {
  display: grid;
  grid-template-columns: 52px 1fr;
  column-gap: 12px;
  align-items: start;
  margin-bottom: 34px;
}

.page-about .about-section-num {
  grid-row: 1 / span 2;
  font-family: var(--font-data);
  font-size: 2rem;
  line-height: 1;
  color: var(--brand);
  margin-top: 4px;
}

.page-about .about-section-head .yx-eyebrow {
  grid-column: 2;
}

.page-about .about-section-head h2 {
  grid-column: 2;
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1.15;
  color: var(--text-primary);
}

.page-about .about-origin-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-origin-copy p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.page-about .about-origin-copy strong {
  color: var(--text-primary);
}

.page-about .about-origin-copy .yx-btn {
  margin-top: 12px;
}

.page-about .about-origin-board {
  position: relative;
  padding: 18px;
  transform: rotate(1deg);
}

.page-about .about-origin-sheet {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.page-about .about-origin-sheet-back {
  position: absolute;
  inset: 12px;
  z-index: 0;
  transform: rotate(-2.4deg);
  border-color: rgba(0, 224, 255, 0.35);
  background: linear-gradient(135deg, rgba(0, 224, 255, 0.08), rgba(0, 255, 157, 0.05));
}

.page-about .about-origin-sheet-main {
  position: relative;
  z-index: 1;
  color: var(--paper-text);
  background: linear-gradient(135deg, var(--paper-bg), #E7E1D3);
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.35);
}

.page-about .about-sheet-label {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--paper-text);
}

.page-about .about-sheet-tag {
  display: inline-block;
  border: 1px solid rgba(31, 41, 55, 0.38);
  padding: 7px 11px;
  margin: 0 8px 10px 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--paper-text);
  background: rgba(255, 255, 255, 0.4);
}

.page-about .about-sheet-tag-blue {
  border-color: rgba(0, 110, 140, 0.6);
  color: #005c70;
}

.page-about .about-sheet-tag-green {
  border-color: rgba(0, 120, 90, 0.6);
  color: #00644a;
}

.page-about .about-sheet-tag-gold {
  border-color: rgba(166, 124, 0, 0.62);
  color: #7a5a00;
}

.page-about .about-sheet-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(31, 41, 55, 0.35);
  font-family: var(--font-data);
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(31, 41, 55, 0.78);
}

.page-about .about-timeline {
  position: relative;
  background: linear-gradient(180deg, transparent 0%, rgba(18, 26, 37, 0.55) 28%, rgba(18, 26, 37, 0.55) 72%, transparent 100%);
}

.page-about .about-timeline-band {
  position: absolute;
  top: 0;
  right: 0;
  width: 68%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 224, 255, 0.13), transparent 62%);
  transform: skewX(-10deg);
  transform-origin: right top;
  pointer-events: none;
}

.page-about .about-timeline-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 12px 0 4px;
}

.page-about .about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 16px;
  padding: 0 0 30px 26px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--brand) 0%, rgba(0, 224, 255, 0.12) 100%);
}

.page-about .about-timeline-item:last-child::before {
  bottom: 52px;
}

.page-about .about-timeline-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(0, 224, 255, 0.14);
  transition: transform var(--trans), background var(--trans), box-shadow var(--trans);
}

.page-about .about-timeline-item:hover::after {
  transform: scale(1.35);
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(0, 255, 157, 0.16);
}

.page-about .about-timeline-item:last-child::after {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 255, 157, 0.14);
}

.page-about .about-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
}

.page-about .about-meta-year {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.page-about .about-meta-version {
  font-family: var(--font-data);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--brand);
}

.page-about .about-milestone {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  overflow: hidden;
  transition: border-color var(--trans), background var(--trans);
}

.page-about .about-milestone:hover {
  border-color: rgba(0, 224, 255, 0.5);
}

.page-about .about-milestone[open] {
  border-color: rgba(0, 224, 255, 0.55);
  background: rgba(18, 26, 37, 0.9);
}

.page-about .about-milestone summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 14px 40px 14px 16px;
}

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

.page-about .about-milestone summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--font-data);
  font-size: 1rem;
  color: var(--brand);
  transition: color var(--trans), transform var(--trans);
}

.page-about .about-milestone[open] summary::after {
  content: "–";
  color: var(--accent);
}

.page-about .about-milestone-tag {
  align-self: flex-start;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  border: 1px solid rgba(0, 255, 157, 0.4);
  border-radius: var(--radius);
  padding: 2px 8px;
}

.page-about .about-milestone-tag-gold {
  color: var(--gold);
  border-color: rgba(255, 196, 0, 0.45);
}

.page-about .about-milestone-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--text-primary);
  transition: color var(--trans);
}

.page-about .about-milestone summary:hover .about-milestone-title {
  color: var(--brand);
}

.page-about .about-milestone-body {
  border-top: 1px dashed var(--border);
  padding: 14px 16px 16px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.68;
}

.page-about .about-milestone-body p {
  margin: 0 0 8px;
}

.page-about .about-milestone-body ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-milestone-body li {
  margin-bottom: 4px;
}

.page-about .about-timeline-figure {
  margin: 8px 0 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transform: rotate(-0.6deg);
}

.page-about .about-timeline-figure img,
.page-about .about-quality-figure img,
.page-about .about-mission-figure img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
}

.page-about .about-timeline-figure figcaption,
.page-about .about-quality-figure figcaption,
.page-about .about-mission-figure figcaption {
  padding: 10px 2px 0;
  font-family: var(--font-data);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.page-about .about-quality {
  background: linear-gradient(180deg, var(--bg-deep) 0%, #0c1520 38%, var(--bg-deep) 100%);
}

.page-about .about-quality .about-section-num {
  color: var(--gold);
}

.page-about .about-quality-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-quality-content {
  order: 1;
}

.page-about .about-quality-figure {
  order: 2;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transform: rotate(0.6deg);
}

.page-about .about-accuracy {
  margin: 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 4.6rem;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 24px rgba(0, 255, 157, 0.22);
  transition: color var(--trans);
}

.page-about .about-accuracy:hover {
  color: var(--gold);
}

.page-about .about-accuracy-label {
  margin: 8px 0 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.page-about .about-quality-lead {
  margin: 0 0 20px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.page-about .about-quality-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-quality-list li {
  padding: 13px 0;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.page-about .about-quality-list strong {
  color: var(--text-primary);
  font-family: var(--font-head);
  font-weight: 700;
  margin-right: 10px;
}

.page-about .about-quality .yx-note {
  margin-bottom: 18px;
}

.page-about .about-mission-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-mission-quote {
  margin: 12px 0 26px;
  padding: 18px 22px;
  border-left: 3px solid var(--gold);
  background: linear-gradient(180deg, rgba(255, 196, 0, 0.08), rgba(255, 196, 0, 0.02));
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.35rem;
  line-height: 1.4;
  color: var(--text-primary);
  transform: rotate(-1deg);
}

.page-about .about-mission-content p {
  margin: 0 0 20px;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 46em;
}

.page-about .about-mission-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-mission-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transform: rotate(1.2deg);
}

@media (min-width: 900px) {
  .page-about {
    padding-top: 24px;
  }

  .page-about .about-hero {
    padding: 64px 0 84px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero h1 {
    font-size: 4.4rem;
    line-height: 1.02;
  }

  .page-about .about-hero-lead {
    font-size: 1.05rem;
  }

  .page-about .about-origin,
  .page-about .about-timeline,
  .page-about .about-quality,
  .page-about .about-mission {
    padding: 72px 0;
  }

  .page-about .about-section-head {
    grid-template-columns: 64px 1fr;
    margin-bottom: 44px;
  }

  .page-about .about-section-num {
    font-size: 2.6rem;
  }

  .page-about .about-section-head h2 {
    font-size: 2.6rem;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }

  .page-about .about-origin-sheet {
    padding: 30px;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 1fr) 400px;
    gap: 48px;
  }

  .page-about .about-timeline-figure {
    position: sticky;
    top: 24px;
  }

  .page-about .about-timeline-item {
    grid-template-columns: 120px 1fr;
    gap: 20px;
    padding-left: 30px;
  }

  .page-about .about-meta-version {
    font-size: 2rem;
  }

  .page-about .about-milestone-title {
    font-size: 1.08rem;
  }

  .page-about .about-quality-grid {
    grid-template-columns: 420px 1fr;
    gap: 56px;
  }

  .page-about .about-quality-content {
    order: 2;
  }

  .page-about .about-quality-figure {
    order: 1;
  }

  .page-about .about-accuracy {
    font-size: 6rem;
  }

  .page-about .about-mission-grid {
    grid-template-columns: minmax(0, 1fr) 440px;
    gap: 56px;
  }

  .page-about .about-mission-quote {
    font-size: 1.7rem;
    padding: 24px 28px;
  }
}