frontend/src/app.css

:root {
  --bg: #0f1117;
  --bg2: #1a1d27;
  --bg3: #252836;
  --border: #2d3148;
  --text: #e2e8f0;
  --muted: #8892a4;
  --accent: #6366f1;
  --accent2: #818cf8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 8px;
}

.app { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }

.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; height: 52px;
  background: var(--bg2); border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 18px; font-weight: 700; color: var(--accent2); letter-spacing: -0.5px; }
.subtitle { font-size: 12px; color: var(--muted); }
.header-right { display: flex; align-items: center; gap: 8px; }

.neo4j-badge {
  display: flex; align-items: center; gap: 4px;
  font-size: 11px; padding: 3px 8px; border-radius: 99px;
  background: var(--bg3); border: 1px solid var(--border); color: var(--muted);
}
.neo4j-badge.ok { color: var(--success); border-color: var(--success); }
.neo4j-badge.error { color: var(--danger); border-color: var(--danger); }

.icon-btn {
  background: transparent; border: 1px solid var(--border);
  color: var(--muted); cursor: pointer; padding: 6px;
  border-radius: var(--radius); display: flex; align-items: center;
  transition: all 0.15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--accent); }

.body { display: flex; flex: 1; overflow: hidden; }

.sidebar {
  width: 280px; background: var(--bg2); border-right: 1px solid var(--border);
  overflow-y: auto; padding: 16px; flex-shrink: 0;
}

.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.tabs {
  display: flex; gap: 4px; padding: 12px 16px 0;
  background: var(--bg2); border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 16px; font-size: 13px; font-weight: 500;
  background: transparent; border: none; color: var(--muted);
  cursor: pointer; border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent2); border-bottom-color: var(--accent2); }

.tab-content { flex: 1; overflow-y: auto; padding: 20px; }

.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 200px; gap: 12px; color: var(--muted);
}

.btn-primary {
  background: var(--accent); color: white; border: none;
  padding: 8px 16px; border-radius: var(--radius); cursor: pointer;
  font-size: 13px; font-weight: 500; transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: var(--bg3); color: var(--text); border: 1px solid var(--border);
  padding: 8px 16px; border-radius: var(--radius); cursor: pointer;
  font-size: 13px; font-weight: 500; transition: all 0.15s;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent2); }

.card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}

.label { font-size: 11px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }

.badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px; border-radius: 99px; font-size: 11px; font-weight: 500;
  background: var(--bg3); border: 1px solid var(--border); color: var(--muted);
}
.badge.causes { color: #f87171; border-color: #f87171; }
.badge.increases { color: #34d399; border-color: #34d399; }
.badge.decreases { color: #fb923c; border-color: #fb923c; }
.badge.enables { color: #60a5fa; border-color: #60a5fa; }
.badge.prevents { color: #a78bfa; border-color: #a78bfa; }
.badge.depends_on { color: #fbbf24; border-color: #fbbf24; }

input, select, textarea {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text); padding: 8px 12px; border-radius: var(--radius);
  font-size: 13px; width: 100%; outline: none;
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }

.spinner {
  width: 20px; height: 20px; border: 2px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-msg { color: var(--danger); font-size: 13px; padding: 8px 12px; background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); border-radius: var(--radius); }