* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #0c1222;
  color: #e7eefc;
}
.topbar {
  padding: 20px;
  border-bottom: 1px solid #24304f;
  background: #101a31;
}
.topbar h1 { margin: 0 0 8px; }
.topbar p { margin: 0; color: #9ab0da; }
.container {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}
.card {
  background: #111b33;
  border: 1px solid #26355a;
  border-radius: 12px;
  padding: 14px;
}
.card h2 { margin-top: 0; }
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.tab-btn {
  border: 1px solid #2f416f;
  border-radius: 8px;
  background: #1a2746;
  color: #dbe7ff;
  padding: 8px 12px;
  font-weight: 700;
  cursor: pointer;
}
.tab-btn.active {
  background: #68a4ff;
  color: #06132c;
  border-color: #68a4ff;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.builder-controls {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}
.builder-controls label {
  color: #b8c9ed;
  font-size: 14px;
}
.builder-controls .inline-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #b8c9ed;
}
.builder-controls .inline-check input {
  width: auto;
  margin: 0;
  accent-color: #68a4ff;
}
.builder-controls input {
  width: 100%;
  border: 1px solid #344a7e;
  border-radius: 8px;
  background: #0f172d;
  color: #e7eefc;
  padding: 10px;
  font-size: 16px;
}
.builder-actions {
  display: flex;
  gap: 8px;
}
.slider-grid {
  display: grid;
  gap: 8px;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.slider-row input[type="range"] {
  flex: 1;
}
.slider-row span {
  min-width: 52px;
  text-align: right;
  color: #b8c9ed;
  font-size: 13px;
}
.builder-grid {
  display: grid;
  grid-template-columns: minmax(240px, 320px) 1fr;
  gap: 12px;
}
.builder-card {
  background: #0f172d;
  border: 1px solid #2a3b67;
  border-radius: 10px;
  padding: 10px;
}
.builder-card h3 {
  margin: 0 0 8px;
}
.formula-canvas-wrap {
  width: 100%;
  border: 1px solid #2a3b67;
  border-radius: 10px;
  background: #0a1122;
  overflow: hidden;
}
#formulaSvg {
  width: 100%;
  height: 760px;
  display: block;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}
.status {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #2b3f6e;
  display: grid;
  gap: 4px;
}
.status.ok { background: #102b24; border-color: #256d53; }
.status.bad { background: #301622; border-color: #8b2d50; }
.status span { font-weight: 700; }
.status small { color: #b9c7e8; }
.actions {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.btn {
  display: inline-block;
  border: 0;
  border-radius: 8px;
  text-decoration: none;
  background: #68a4ff;
  color: #06132c;
  padding: 8px 12px;
  font-weight: 700;
  cursor: pointer;
}
.btn.secondary {
  background: #2a3759;
  color: #d8e5ff;
}
iframe {
  width: 100%;
  min-height: 720px;
  border: 1px solid #2a3b67;
  border-radius: 10px;
  background: #fff;
}
.muted { color: #9ab0da; }
pre {
  background: #0a1122;
  border: 1px solid #2a3b67;
  border-radius: 8px;
  padding: 10px;
  overflow: auto;
}
code { color: #d7e6ff; }

@media (max-width: 980px) {
  .builder-grid {
    grid-template-columns: 1fr;
  }
  .mb-layout {
    grid-template-columns: 1fr !important;
  }
}

/* ── Molecule Builder Tab ──────────────────────────────────────── */
.mb-toolbar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
  padding: 10px;
  background: #0f172d;
  border: 1px solid #2a3b67;
  border-radius: 10px;
}
.mb-toolbar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.mb-label {
  color: #7b93c4;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  min-width: 55px;
}
.mb-btn-group {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.mb-atom-btn,
.mb-tool-btn,
.mb-bond-btn,
.mb-view-btn {
  border: 1px solid #344a7e;
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  background: #1a2746;
  color: #dbe7ff;
}
.mb-atom-btn.active,
.mb-tool-btn.active,
.mb-bond-btn.active,
.mb-view-btn.active {
  outline: 2px solid #68a4ff;
  outline-offset: 1px;
  box-shadow: 0 0 8px rgba(104, 164, 255, 0.35);
}
.mb-atom-btn:hover,
.mb-tool-btn:hover,
.mb-bond-btn:hover,
.mb-view-btn:hover {
  border-color: #68a4ff;
}
.mb-import-input {
  border: 1px solid #344a7e;
  border-radius: 6px;
  background: #0f172d;
  color: #e7eefc;
  padding: 5px 10px;
  font-size: 14px;
  width: 180px;
}
.mb-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mb-canvas-col,
.mb-render-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.mb-canvas-label {
  color: #7b93c4;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.mb-canvas-wrap {
  width: 100%;
  border: 1px solid #2a3b67;
  border-radius: 10px;
  background: #0a1122;
  overflow: hidden;
}
#mbDrawSvg {
  width: 100%;
  height: 600px;
  display: block;
}
#mbTilingSvg {
  width: 100%;
  height: 600px;
  display: block;
}
#mb3DWrap {
  width: 100%;
  min-height: 600px;
  border-radius: 10px;
}