.section-head {
  display: grid;
  gap: 1rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  max-width: 54rem;
}

.eyebrow {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.78rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(248, 252, 251, 0.7);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.eyebrow-dot {
  width: 0.52rem;
  height: 0.52rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #7de8d0);
  box-shadow: 0 0 16px rgba(73, 214, 188, 0.45);
}

.lede {
  font-size: clamp(1.1rem, 1.9vw, 1.38rem);
  line-height: 1.7;
  color: var(--text);
}

.stat-chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.stat-chip {
  min-width: 11rem;
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(247, 251, 250, 0.76);
}

.stat-chip strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.05;
  color: var(--text-strong);
}

.stat-chip span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.chapter-grid,
.split-grid {
  display: grid;
  gap: 1.25rem;
}

.media-frame {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(247, 252, 250, 0.4);
  box-shadow: var(--shadow-soft);
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  padding: 0.95rem 1rem 1.05rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: rgba(249, 252, 251, 0.94);
}

.brand-rail {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.brand-pill {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 4.25rem;
  padding: 1rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  box-shadow: var(--shadow-card);
  transition: transform 0.35s var(--ease-out), border-color 0.35s ease, box-shadow 0.35s ease;
}

.brand-pill img {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.brand-pill:hover {
  transform: translateY(-3px);
  border-color: rgba(12, 140, 119, 0.3);
  box-shadow: 0 20px 38px rgba(10, 25, 32, 0.12);
}

.maintainer-card {
  display: grid;
  gap: 1rem;
  grid-template-columns: auto 1fr;
  align-items: start;
}

.maintainer-avatar {
  width: clamp(4.5rem, 7vw, 5.75rem);
  aspect-ratio: 1;
  border-radius: 1.4rem;
  object-fit: cover;
}

.maintainer-copy {
  display: grid;
  gap: 0.6rem;
}

.meta-row,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.meta-row a,
.chip-row a,
.mini-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.72rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(249, 252, 251, 0.78);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
}

.social-icon {
  width: 1rem;
  height: 1rem;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
}

.social-icon.fill {
  stroke: none;
  fill: currentColor;
}

.notice-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.notice-card {
  display: grid;
  gap: 0.55rem;
  border-left: 4px solid rgba(12, 140, 119, 0.64);
}

.prose-stack {
  display: grid;
  gap: 1rem;
}

.principle-list,
.operator-list,
.bullet-stack {
  display: grid;
  gap: 0.72rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.principle-list li,
.operator-list li,
.bullet-stack li {
  display: grid;
  gap: 0.16rem;
  padding-left: 1rem;
  position: relative;
}

.principle-list li::before,
.operator-list li::before,
.bullet-stack li::before {
  content: "";
  position: absolute;
  top: 0.65rem;
  left: 0;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 999px;
  background: var(--accent);
}

.card-row {
  display: grid;
  gap: 1rem;
}

.card-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.timeline-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.timeline-card {
  min-height: 100%;
  display: grid;
  gap: 0.7rem;
}

.timeline-year {
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--accent-strong);
}

.empty-state {
  padding: 1.2rem;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--line-strong);
  color: var(--text-muted);
  background: rgba(249, 252, 251, 0.68);
}

@media (max-width: 1024px) {
  .brand-rail,
  .timeline-grid,
  .notice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .brand-rail,
  .timeline-grid,
  .notice-grid,
  .maintainer-card {
    grid-template-columns: 1fr;
  }

  .maintainer-card {
    grid-template-columns: 1fr;
  }
}