:root { font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color:#1f2937; background:#f3f4f6; }
* { box-sizing:border-box; }
body { margin:0; }
.topbar { background:#fff; border-bottom:1px solid #d1d5db; padding:18px max(24px, calc((100vw - 1400px)/2)); display:flex; align-items:center; justify-content:space-between; gap:20px; }
h1 { margin:0 0 3px; font-size:1.55rem; }
h2 { margin-top:0; font-size:1.1rem; }
p { margin:0; }
main { max-width:1400px; margin:0 auto; padding:24px; }
.card { background:#fff; border:1px solid #d1d5db; border-radius:12px; padding:18px; box-shadow:0 2px 8px rgba(0,0,0,.04); }
.compact { max-width:760px; margin:40px auto; }
.grid2, .workspace-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.workspace-grid.lower { margin-top:18px; }
label { display:flex; flex-direction:column; gap:6px; font-weight:600; font-size:.92rem; }
input, select, textarea { width:100%; border:1px solid #9ca3af; border-radius:8px; padding:10px; font:inherit; background:#fff; }
textarea { font-family:"SFMono-Regular", Consolas, "Liberation Mono", monospace; resize:vertical; line-height:1.45; }
button { border:0; border-radius:8px; padding:10px 15px; font-weight:700; cursor:pointer; background:#2563eb; color:white; }
button.secondary { background:#e5e7eb; color:#111827; }
button.primary-strong { background:#166534; }
button:disabled { opacity:.55; cursor:not-allowed; }
.actions, .footer-actions { display:flex; gap:10px; flex-wrap:wrap; margin-top:12px; }
.footer-actions { margin-top:18px; align-items:center; justify-content:flex-end; }
.preview-card { min-height:520px; }
#svgPreview { min-height:430px; display:flex; align-items:center; justify-content:center; overflow:auto; background:#fafafa; border:1px dashed #cbd5e1; border-radius:8px; padding:12px; }
#svgPreview svg { max-width:100%; height:auto; }
.preview-placeholder { color:#6b7280; }
.hint { color:#6b7280; font-size:.9rem; margin:6px 0 12px; }
.sessionbar { display:flex; justify-content:space-between; gap:12px; margin-bottom:12px; padding:10px 14px; background:#eef2ff; border-radius:8px; }
.mode { padding:7px 10px; border-radius:999px; font-weight:800; font-size:.8rem; text-transform:uppercase; }
.mode-learning { background:#dcfce7; color:#166534; }
.mode-exercise { background:#fef3c7; color:#92400e; }
.mode-evaluation { background:#fee2e2; color:#991b1b; }
.message { margin-top:12px; padding:10px; border-radius:8px; white-space:pre-wrap; }
.message.error { background:#fee2e2; color:#991b1b; }
.message.ok { background:#dcfce7; color:#166534; }
.hidden { display:none !important; }
[hidden] { display:none !important; }
@media (max-width:900px) { .workspace-grid, .grid2 { grid-template-columns:1fr; } .preview-card { min-height:350px; } #svgPreview { min-height:280px; } }

.mcd-image {
  display: block;
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
}

.model-tabs {
  display: flex;
  gap: 8px;
  margin: 0 0 18px;
  padding: 6px;
  background: #e5e7eb;
  border-radius: 12px;
}
.model-tab {
  flex: 1;
  background: transparent;
  color: #374151;
  border: 1px solid transparent;
  padding: 11px 16px;
}
.model-tab.active {
  background: #ffffff;
  color: #1d4ed8;
  border-color: #cbd5e1;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.model-tab:disabled {
  background: transparent;
  color: #9ca3af;
  opacity: .75;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.single-panel { min-height: 520px; }
.dialect-label { max-width: 360px; margin-bottom: 12px; }
@media (max-width: 700px) {
  .model-tabs { flex-direction: column; }
}

.syntax-help { margin: 10px 0 12px; border: 1px solid #d1d5db; border-radius: 8px; background: #f9fafb; }
.syntax-help summary { cursor: pointer; font-weight: 700; padding: 10px 12px; }
.syntax-help-content { padding: 0 12px 12px; font-size: .9rem; }
.syntax-help-content p { margin: 8px 0 4px; }
.syntax-help-content code { display: block; background: #eef2ff; border-radius: 6px; padding: 7px 9px; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.warning-note { color: #92400e; }

.sessionbar > div {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.compact-button {
  padding: 7px 11px;
  align-self: center;
}
#relationalPreview {
  min-height: 430px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  background: #fafafa;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  padding: 12px;
}
.submission-dialog {
  width: min(1050px, 94vw);
  max-height: 90vh;
  padding: 0;
  border: 0;
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(0,0,0,.28);
}
.submission-dialog::backdrop { background: rgba(15,23,42,.5); }
.submission-card { padding: 20px; }
.dialog-header, .dialog-actions, .submission-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.dialog-actions {
  justify-content: flex-end;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid #e5e7eb;
}
.submission-meta {
  background: #eef2ff;
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 14px;
}
.submission-section { margin-top: 14px; }
.submission-section h3 { margin: 0 0 7px; font-size: 1rem; }
.submission-section pre {
  max-height: 180px;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 10px;
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
.submission-section ul { margin: 6px 0 0; padding-left: 22px; }
@media (max-width: 700px) {
  .dialog-header, .submission-meta { align-items: flex-start; flex-direction: column; }
  .sessionbar { align-items: flex-start; }
}