/* ===================== ARCHITECTURE LAYERS ===================== */
.arch-container {
  display: flex; flex-direction: column; gap: 10px;
  max-width: 1100px; margin: 0 auto; position: relative;
}
.arch-layer {
  display: flex; align-items: stretch; gap: 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 20px;
  cursor: pointer; transition: all .3s; position: relative; overflow: hidden;
}
.arch-layer::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
}
.arch-layer[data-layer="0"]::before { background: var(--layer0); }
.arch-layer[data-layer="1"]::before { background: var(--layer1); }
.arch-layer[data-layer="2"]::before { background: var(--layer2); }
.arch-layer[data-layer="3"]::before { background: var(--layer3); }
.arch-layer[data-layer="4"]::before { background: var(--layer4); }
.arch-layer[data-layer="5"]::before { background: var(--layer5); }
.arch-layer[data-layer="6"]::before { background: var(--layer6); }

.arch-layer:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.layer-badge {
  position: absolute; top: 8px; right: 12px;
  font-size: 11px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--text-muted); font-weight: 600;
}
.layer-label {
  width: 48px; min-width: 48px; display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 900; border-radius: 8px;
}
.arch-layer[data-layer="0"] .layer-label { color: var(--layer0); }
.arch-layer[data-layer="1"] .layer-label { color: var(--layer1); }
.arch-layer[data-layer="2"] .layer-label { color: var(--layer2); }
.arch-layer[data-layer="3"] .layer-label { color: var(--layer3); }
.arch-layer[data-layer="4"] .layer-label { color: var(--layer4); }
.arch-layer[data-layer="5"] .layer-label { color: var(--layer5); }
.arch-layer[data-layer="6"] .layer-label { color: var(--layer6); }

.layer-info { flex: 0 0 280px; }
.layer-info h3 { font-size: 16px; font-weight: 700; margin-bottom: 2px; }
.layer-info p { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.layer-question {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 2px 10px; border-radius: 20px; margin-top: 4px;
}
.arch-layer[data-layer="0"] .layer-question { background: rgba(59,130,246,0.15); color: var(--layer0); }
.arch-layer[data-layer="1"] .layer-question { background: rgba(245,158,11,0.15); color: var(--layer1); }
.arch-layer[data-layer="2"] .layer-question { background: rgba(239,68,68,0.15); color: var(--layer2); }
.arch-layer[data-layer="3"] .layer-question { background: rgba(139,92,246,0.15); color: var(--layer3); }
.arch-layer[data-layer="4"] .layer-question { background: rgba(6,182,212,0.15); color: var(--layer4); }
.arch-layer[data-layer="5"] .layer-question { background: rgba(34,197,94,0.15); color: var(--layer5); }
.arch-layer[data-layer="6"] .layer-question { background: rgba(244,114,182,0.15); color: var(--layer6); }

.layer-projects {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  flex: 1; padding-left: 12px;
}
.layer-proj-chip {
  font-size: 12px; font-weight: 500; padding: 4px 10px; border-radius: 6px;
  cursor: pointer; transition: all .2s;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
}
.layer-proj-chip:hover {
  border-color: var(--accent);
  background: rgba(56,189,248,0.08);
}

/* ===================== EVENT BUS BAR ===================== */
.arch-eventbus {
  margin-top: 8px;
}
.eventbus-inner {
  background: linear-gradient(90deg, rgba(56,189,248,0.08), rgba(129,140,248,0.08), rgba(52,211,153,0.08));
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  padding: 14px 24px;
  text-align: center; font-size: 14px; font-weight: 600;
  color: var(--accent);
  letter-spacing: .5px;
}
.eventbus-icon { margin: 0 6px; }

@media (max-width: 900px) {
  .arch-layer { flex-direction: column; }
  .layer-info { flex: none; }
  .layer-projects { padding-left: 0; }
}