.page-about {
  --about-line-on-dark: rgba(245, 240, 230, 0.18);
  background: var(--c-cream);
  color: var(--c-ink);
}

.page-about .profile-overview,
.page-about .access-panel {
  background: var(--c-ink);
  color: var(--c-cream);
}

.page-about .category-panel {
  background: var(--c-cream);
  color: var(--c-ink);
}

.page-about .update-panel {
  background: var(--c-forest);
  color: var(--c-cream);
}

.page-about .version-panel {
  background: var(--c-sand);
  color: var(--c-ink);
}

.page-about .profile-overview,
.page-about .category-panel,
.page-about .update-panel,
.page-about .version-panel,
.page-about .access-panel {
  padding-block: 1.6rem 2.4rem;
}

.page-about .breadcrumbs {
  margin: 1rem 0 0;
}

.page-about .panel-head {
  margin-bottom: 1.4rem;
}

.page-about .panel-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: var(--c-orange);
  color: var(--c-white);
  padding: 0.3rem 0.6rem;
  border-radius: 3px;
  margin-bottom: 0.6rem;
}

.page-about .panel-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1.18;
  margin: 0 0 0.6rem;
}

.page-about .panel-desc {
  max-width: 72ch;
  font-size: 0.98rem;
  line-height: 1.62;
  color: var(--c-gray);
  margin: 0;
}

.page-about .update-panel .panel-title,
.page-about .access-panel .panel-title,
.page-about .profile-overview h1 {
  color: var(--c-white);
}

.page-about .update-panel .panel-desc,
.page-about .access-panel .panel-desc {
  color: rgba(245, 240, 230, 0.78);
}

.page-about .overview-kicker {
  font-family: var(--font-mono);
  color: var(--c-yellow);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.page-about .profile-overview h1 {
  font-size: clamp(1.9rem, 4.6vw, 3.1rem);
  font-weight: 900;
  line-height: 1.12;
  margin: 0 0 0.8rem;
}

.page-about .overview-lead {
  max-width: 78ch;
  font-size: clamp(1rem, 2vw, 1.08rem);
  line-height: 1.66;
  color: rgba(245, 240, 230, 0.88);
  margin: 0 0 1rem;
}

.page-about .overview-lead strong {
  color: var(--c-yellow);
}

.page-about .overview-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--c-teal);
  padding-top: 0.8rem;
  border-top: 1px solid var(--about-line-on-dark);
  margin: 0.5rem 0 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}

.page-about .overview-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line-on-dark);
  border-radius: var(--radius);
  margin-bottom: 1.4rem;
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.7rem;
}

.page-about .stat-card {
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  padding: 0.9rem 0.95rem;
  border-left: 4px solid var(--c-yellow);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .stat-card:nth-child(2n) {
  border-left-color: var(--c-teal);
}

.page-about .stat-card:nth-child(3n) {
  border-left-color: var(--c-orange);
}

.page-about .stat-card:nth-child(4n) {
  border-left-color: var(--c-purple);
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(245, 240, 230, 0.72);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.12;
}

.page-about .stat-note {
  font-size: 0.78rem;
  color: rgba(245, 240, 230, 0.6);
}

.page-about .tree-layout {
  display: grid;
  gap: 1.4rem;
  align-items: start;
}

.page-about .tree-main {
  min-width: 0;
}

.page-about .tree-col-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .tree-col-title::before {
  content: "";
  width: 22px;
  height: 10px;
  background: var(--c-yellow);
  border-radius: 2px;
  display: inline-block;
}

.page-about .tier-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .tier-row {
  background: var(--c-white);
  border: 1px solid var(--c-sand);
  border-left: 6px solid var(--c-ink);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.page-about .tier-code {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-orange);
  font-weight: 700;
  padding: 0.22rem 0.45rem;
  background: var(--c-cream);
  border-radius: 3px;
  line-height: 1.3;
}

.page-about .tier-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .tier-name {
  font-size: 1.02rem;
  line-height: 1.4;
}

.page-about .tier-tags {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--c-gray);
}

.page-about .tier-path {
  font-size: 0.84rem;
  color: var(--c-ink);
  padding-left: 0.5rem;
  border-left: 3px solid var(--c-teal);
}

.page-about .tree-more {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.9rem 0 0;
  font-size: 0.9rem;
}

.page-about .tag-index {
  background: var(--c-ink);
  color: var(--c-cream);
  padding: 1.2rem;
  border-radius: var(--radius);
}

.page-about .tag-index h3 {
  color: var(--c-yellow);
  font-family: var(--font-head);
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.page-about .tag-index p {
  margin: 0 0 0.8rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: rgba(245, 240, 230, 0.75);
}

.page-about .tag-pile {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-about .tag-mini {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  padding: 0.32rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-cream);
}

.page-about .tag-index-note {
  margin-top: 0.8rem;
  font-size: 0.78rem;
  color: rgba(245, 240, 230, 0.65);
}

.page-about .flow-track {
  display: grid;
  gap: 0.8rem;
  margin: 1rem 0 1.8rem;
}

.page-about .flow-step {
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-yellow);
  line-height: 1.4;
}

.page-about .flow-step strong {
  display: block;
  color: var(--c-white);
  font-size: 1.02rem;
}

.page-about .flow-step p {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: rgba(245, 240, 230, 0.72);
}

.page-about .flow-arrow {
  color: var(--c-teal);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  text-align: center;
}

.page-about .batch-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.page-about .batch-card {
  background: rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  border-top: 3px solid var(--c-teal);
}

.page-about .batch-card.is-current {
  background: var(--c-yellow);
  color: var(--c-ink);
  border-top-color: var(--c-white);
  grid-column: span 2;
}

.page-about .batch-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(245, 240, 230, 0.75);
}

.page-about .batch-card.is-current .batch-label {
  color: rgba(44, 62, 80, 0.8);
}

.page-about .batch-num {
  font-size: 1.4rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--c-white);
  line-height: 1.2;
}

.page-about .batch-card.is-current .batch-num {
  color: var(--c-ink);
}

.page-about .batch-note {
  font-size: 0.8rem;
  color: rgba(245, 240, 230, 0.65);
}

.page-about .batch-card.is-current .batch-note {
  color: var(--c-ink);
}

.page-about .update-more {
  margin: 1.4rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.page-about .version-wrap {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}

.page-about .version-main {
  min-width: 0;
}

.page-about .version-timeline {
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 0;
}

.page-about .version-item {
  position: relative;
  padding: 0 0 1.5rem 1.7rem;
  border-left: 3px solid var(--c-orange);
  margin-left: 0.3rem;
}

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

.page-about .version-dot {
  position: absolute;
  left: -11px;
  top: 2px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--c-yellow);
  border: 3px solid var(--c-ink);
}

.page-about .version-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--c-orange);
  display: block;
  margin-bottom: 0.25rem;
}

.page-about .version-detail {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--c-ink);
}

.page-about .version-decoration {
  width: 100%;
  max-width: 240px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  margin: 0 auto;
  display: block;
}

.page-about .access-wrap {
  display: grid;
  gap: 1.6rem;
}

.page-about .access-points {
  display: grid;
  gap: 0.7rem;
}

.page-about .access-point {
  background: rgba(255, 255, 255, 0.07);
  border-left: 4px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  line-height: 1.55;
  color: rgba(245, 240, 230, 0.88);
}

.page-about .access-point:nth-child(2n) {
  border-left-color: var(--c-teal);
}

.page-about .access-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-yellow);
  letter-spacing: 0.04em;
  margin-right: 0.5rem;
}

.page-about .access-point strong {
  color: var(--c-white);
}

.page-about .access-point a {
  color: var(--c-yellow);
}

.page-about .device-showcase {
  display: grid;
  gap: 1rem;
}

.page-about .device {
  background: var(--c-ink);
  border: 1px solid rgba(245, 240, 230, 0.25);
  border-radius: 10px;
  overflow: hidden;
}

.page-about .device-bar {
  background: var(--c-yellow);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.7rem;
}

.page-about .device-screen {
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.page-about .screen-line {
  display: block;
  background: rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--c-teal);
  border-radius: 3px;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-cream);
}

.page-about .screen-line.screen-title {
  background: rgba(230, 126, 34, 0.22);
  border-left-color: var(--c-orange);
  font-weight: 700;
}

.page-about .device-mobile {
  max-width: 280px;
  margin: 0 auto;
  width: 100%;
  border-radius: 18px;
}

.page-about .access-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .access-more {
  margin: 1.4rem 0 0;
  font-size: 0.9rem;
}

.page-about .access-more a {
  color: var(--c-yellow);
}

@media (min-width: 640px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .stat-num {
    font-size: 1.7rem;
  }
}

@media (min-width: 760px) {
  .page-about .tier-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .page-about .batch-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .batch-card.is-current {
    grid-column: span 1;
  }

  .page-about .batch-num {
    font-size: 1.3rem;
  }
}

@media (min-width: 860px) {
  .page-about .flow-track {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    align-items: stretch;
  }

  .page-about .flow-arrow {
    display: none;
  }

  .page-about .flow-step {
    flex-direction: column;
  }

  .page-about .access-points {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .device-showcase {
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
  }

  .page-about .device-mobile {
    max-width: none;
  }
}

@media (min-width: 900px) {
  .page-about .version-wrap {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 2rem;
  }

  .page-about .version-decoration {
    max-width: 100%;
  }
}

@media (min-width: 1000px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .tree-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 1.6rem;
  }
}