.page-about {
  --about-ink-soft: #52606d;
}

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

.page-about .about-hero {
  background: linear-gradient(135deg, var(--paper-blue) 0%, #eef5fa 58%, var(--paper) 100%);
  border-bottom: 4px solid var(--accent);
  padding: 28px 0 0;
}

.page-about .about-hero .container {
  padding-bottom: 28px;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 18px;
  font-size: 13px;
}

.page-about .about-hero-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(232, 97, 42, 0.08);
  border: 1px solid rgba(232, 97, 42, 0.25);
  border-radius: 999px;
  padding: 4px 12px;
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.22;
  max-width: 16em;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero-lead {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-hero-banner {
  overflow: hidden;
}

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

.page-about .about-overview,
.page-about .about-taxonomy,
.page-about .about-updates,
.page-about .about-version,
.page-about .about-more {
  padding: 40px 0;
}

.page-about .about-overview {
  background: var(--paper);
}

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

.page-about .about-overview-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 62ch;
  margin: 16px 0 0;
}

.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-stat {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 14px;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--tag-blue);
}

.page-about .about-stat-accent::before {
  background: var(--accent);
}

.page-about .about-stat-blue::before {
  background: var(--blue);
}

.page-about .about-stat-violet::before {
  background: var(--tag-violet);
}

.page-about .about-stat-green::before {
  background: var(--tag-green);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.15;
  color: var(--ink);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.4;
  color: #6b7280;
}

.page-about .about-taxonomy {
  background: linear-gradient(180deg, var(--paper-blue) 0%, var(--paper) 100%);
}

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

.page-about .about-tree {
  display: grid;
  gap: 12px;
}

.page-about .about-tree-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 6px solid var(--tag-blue);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.04);
}

.page-about .about-tree-tone-yellow {
  border-left-color: var(--tag-gold);
}

.page-about .about-tree-tone-pink {
  border-left-color: #d9a0a0;
}

.page-about .about-tree-tone-green {
  border-left-color: var(--tag-green);
}

.page-about .about-tree-tone-night {
  border-left-color: var(--night);
}

.page-about .about-tree-tone-teal {
  border-left-color: #2a9d8f;
}

.page-about .about-tree-tone-violet {
  border-left-color: var(--tag-violet);
}

.page-about .about-tree-tone-gold {
  border-left-color: var(--tag-gold);
}

.page-about .about-tree-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: inherit;
}

.page-about .about-tree-caret {
  display: inline-flex;
  flex: none;
  width: 18px;
  height: 18px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--accent);
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--paper);
}

.page-about .about-tree-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-tree-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  background: rgba(232, 97, 42, 0.08);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}

.page-about .about-tree-sub {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 10px 0 0;
  padding: 10px 0 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-tree-sub li {
  background: #f5f7fa;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  padding: 4px 10px;
  color: #4a5568;
}

.page-about .about-tree-figure {
  margin: 0;
  align-self: start;
  background: rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg);
  padding: 12px;
}

.page-about .about-tree-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.page-about .about-tree-figure figcaption {
  font-size: 13px;
  color: #6b7280;
  margin-top: 8px;
  text-align: center;
  line-height: 1.5;
}

.page-about .about-updates {
  background: var(--paper-yellow);
}

.page-about .about-updates-rule {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-rule-item {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
  background: rgba(255, 255, 255, 0.65);
  padding: 10px 12px;
  border-radius: var(--radius);
  border-left: 4px solid var(--tag-gold);
}

.page-about .about-rule-item strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
  min-width: 76px;
}

.page-about .about-batch-timeline {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-batch-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.72);
  border-radius: var(--radius);
  margin-bottom: 8px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

.page-about .about-batch-index {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
  min-width: 58px;
}

.page-about .about-batch-title {
  font-size: 14px;
  color: #525e6a;
}

.page-about .about-batch-state {
  margin-left: auto;
  font-size: 12px;
  font-weight: 700;
  color: var(--gray);
  background: #eceff3;
  padding: 3px 8px;
  border-radius: 999px;
}

.page-about .about-batch-item.is-current {
  background: var(--card);
  border: 1px solid rgba(232, 97, 42, 0.35);
}

.page-about .about-batch-item.is-current .about-batch-index {
  color: var(--accent);
}

.page-about .about-batch-item.is-current .about-batch-state {
  background: rgba(232, 97, 42, 0.12);
  color: var(--accent);
}

.page-about .about-version {
  background: var(--paper-green);
}

.page-about .about-version-grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-version-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border-top: 6px solid var(--blue);
  padding: 22px;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.04);
}

.page-about .about-version-mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--card);
  background: var(--night);
  border-radius: 6px;
  padding: 4px 10px;
  letter-spacing: 0.02em;
}

.page-about .about-version-card h3 {
  margin: 14px 0 8px;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-version-features {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-version-features li {
  padding: 6px 0 6px 24px;
  position: relative;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  border-bottom: 1px dashed var(--line);
}

.page-about .about-version-features li:last-child {
  border-bottom: 0;
}

.page-about .about-version-features li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 13px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

.page-about .about-version-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: #6b7280;
}

.page-about .about-tablet {
  background: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.page-about .about-tablet h3 {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .about-tablet > p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.6;
  color: #667;
}

.page-about .about-tablet-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  position: relative;
  display: flex;
  gap: 12px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 12px;
  border: 1px solid var(--line);
}

.page-about .about-step-num {
  flex: none;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--card);
  background: var(--accent);
  border-radius: 50%;
}

.page-about .about-step-text {
  font-size: 14px;
  line-height: 1.55;
  padding-top: 4px;
  color: var(--ink);
}

.page-about .about-tablet-figure {
  margin: 18px 0 0;
}

.page-about .about-tablet-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.page-about .about-tablet-figure figcaption {
  font-size: 12px;
  color: #778;
  margin-top: 6px;
  line-height: 1.5;
}

.page-about .about-more {
  background: var(--night);
}

.page-about .about-more .section-heading h2 {
  color: #fff;
}

.page-about .about-more .section-sub {
  color: #bcc8d4;
}

.page-about .about-more-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-more-card {
  display: block;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 18px;
  color: #fff;
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-more-card-label {
  display: block;
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-more-card-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: #a8b5c2;
}

.page-about .about-more-card:hover {
  border-color: var(--accent);
  background: rgba(232, 97, 42, 0.12);
  transform: translateY(-2px);
}

@media (min-width: 720px) {
  .page-about .about-overview-layout {
    grid-template-columns: 1fr 0.9fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .about-stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-about .about-tree-layout {
    grid-template-columns: 1fr 300px;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-updates-rule {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-version-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 24px;
    align-items: start;
  }

  .page-about .about-tablet-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .page-about .about-step {
    flex-direction: column;
    padding: 16px 14px;
  }

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

@media (min-width: 960px) {
  .page-about .about-overview,
  .page-about .about-taxonomy,
  .page-about .about-updates,
  .page-about .about-version,
  .page-about .about-more {
    padding: 56px 0;
  }

  .page-about .about-batch-item {
    padding: 14px 16px;
  }

  .page-about .about-version-card,
  .page-about .about-tablet {
    padding: 28px;
  }
}