/* ============ ARCHITECTURE PAGE ============ */

/* Reuse top-nav from story.css — inline here for independence */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(8, 9, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-back, .nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-back:hover, .nav-link:hover { color: var(--accent); }

/* ---- Arch Hero ---- */
.arch-hero {
  text-align: center;
  padding: 10rem 2rem 4rem;
  max-width: 700px;
  margin: 0 auto;
}

.arch-hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.arch-hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ---- Sections ---- */
.arch-section {
  max-width: 960px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-top: 1px solid var(--border);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.arch-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 700px;
}

/* ---- Evolution Grid ---- */
.evolution-grid {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 1rem;
}

.evo-card {
  flex-shrink: 0;
  width: 180px;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.3s;
}

.evo-card:hover { border-color: var(--border-accent); }

.evo-card-now {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.evo-day {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.evo-content h3 {
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.evo-content p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.evo-content code {
  font-size: 0.7rem;
}

.evo-arrow {
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 1.2rem;
  padding: 0 0.5rem;
}

/* ---- Zones Diagram ---- */
.zones-diagram {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.zone-ring {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
}

.zone-ring-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.zone-ring-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.zone-ring-files {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.7;
}

.zone-ring-kernel {
  background: rgba(248, 81, 73, 0.05);
  border-color: rgba(248, 81, 73, 0.2);
  grid-column: 1 / -1;
}
.zone-ring-kernel .zone-ring-label { color: var(--red); }
.zone-ring-kernel .zone-ring-profil {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--orange-soft);
  border-color: rgba(210, 153, 34, 0.2);
}
.zone-ring-profil .zone-ring-label { color: var(--orange); }

.zone-ring-satellite {
  background: var(--blue-soft);
  border-color: rgba(88, 166, 255, 0.2);
}
.zone-ring-satellite .zone-ring-label { color: var(--blue); }

.zone-ring-instance {
  background: var(--green-soft);
  border-color: rgba(63, 185, 80, 0.2);
}
.zone-ring-instance .zone-ring-label { color: var(--green); }

.zone-ring-work {
  background: var(--bg-card);
  grid-column: 1 / -1;
}
.zone-ring-work .zone-ring-label { color: var(--text-muted); }

/* ---- BSI ---- */
.bsi-concepts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.bsi-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.bsi-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.bsi-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.bsi-example {
  display: block;
  padding: 0.5rem 0.75rem;
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--accent);
}

.signal-types {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.signal-chip {
  padding: 0.3rem 0.6rem;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
}

.signal-checkpoint { background: var(--blue-soft); color: var(--blue); }
.signal-handoff { background: var(--green-soft); color: var(--green); }
.signal-blocked { background: rgba(248, 81, 73, 0.1); color: var(--red); }
.signal-info { background: var(--bg-surface); color: var(--text-muted); }

.close-tiers {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.close-tier {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.close-tier:last-child { border-bottom: none; }

/* BSI Evolution */
.bsi-evolution {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.bsi-evolution h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.version-line {
  display: flex;
  justify-content: space-between;
  position: relative;
  padding: 0 1rem;
}

.version-line::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--border);
}

.version-dot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  z-index: 1;
}

.version-dot span {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 2px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--text-muted);
}

.version-dot.active span {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
  box-shadow: 0 0 12px var(--accent-glow);
}

.version-dot small {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 80px;
}

/* ---- BHP Layers ---- */
.bhp-layers {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.bhp-layer {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.bhp-layer:last-child { border-bottom: none; }

.bhp-layer-head {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
  min-width: 200px;
}

.bhp-layer-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}

.bhp-layer-pct {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.bhp-layer p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

.bhp-l0 { background: rgba(248, 81, 73, 0.05); }
.bhp-l0 .bhp-layer-name { color: var(--red); }
.bhp-l1 { background: var(--orange-soft); }
.bhp-l1 .bhp-layer-name { color: var(--orange); }
.bhp-l2 { background: var(--blue-soft); }
.bhp-l2 .bhp-layer-name { color: var(--blue); }
.bhp-l3 { background: var(--bg-card); }
.bhp-l3 .bhp-layer-name { color: var(--text-muted); }

/* ---- Agents ---- */
.agent-categories {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.agent-cat h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.scribe-rule {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.scribe-rule::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--blue));
}

.scribe-rule p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 0.75rem 0 1.5rem;
}

.scribe-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.flow-step {
  padding: 0.5rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.flow-scribe { border-color: var(--border-accent); color: var(--accent); }
.flow-zone { border-color: rgba(63, 185, 80, 0.3); color: var(--green); }

.flow-arrow {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ---- Constitution ---- */
.constitution-pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.pillar {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.pillar:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.pillar-icon {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
  margin-bottom: 1rem;
}

.pillar h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.pillar p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.pillar em {
  color: var(--accent);
}

/* ---- Metrics ---- */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.metric-big {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: border-color 0.3s;
}

.metric-big:hover { border-color: var(--border-accent); }

.metric-big-val {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-big-key {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.commit-types {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.commit-types h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.commit-rule {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---- Epilogue ---- */
.arch-epilogue {
  text-align: center;
  padding: 5rem 2rem;
  border-top: 1px solid var(--border);
}

.arch-epilogue-content {
  max-width: 600px;
  margin: 0 auto;
}

.arch-epilogue p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.epilogue-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .arch-hero { padding: 8rem 1.25rem 3rem; }
  .arch-hero h1 { font-size: 2.5rem; }
  .arch-section { padding: 3rem 1.25rem; }

  .evolution-grid { flex-wrap: nowrap; overflow-x: auto; }
  .evo-card { width: 160px; }

  .zones-diagram { grid-template-columns: 1fr; }
  .bsi-concepts { grid-template-columns: 1fr; }
  .constitution-pillars { grid-template-columns: repeat(2, 1fr); }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }

  .bhp-layer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .constitution-pillars { grid-template-columns: 1fr; }
}