body {
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;
  margin: 0;
  padding: 0;
  background: #f3f4f6;
}

.title {
  font-family: serif;
  font-weight: bold;
  text-align: center;
  font-size: 1.5rem;
  margin-top: 2rem;
}

.title a {
  color: rgb(44 153 206);
  text-decoration: underline;
}

.container {
  padding: 1.5rem;
  min-height: calc(100vh - 60px);
  margin-bottom: 3rem;
}

.top-buttons {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
}

.simulator-card {
  background: #f3f4f6;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: 0 0px 6px rgba(0,0,0,0.1);
}

.editor-section{
    padding-right: 20px;
}

.editor-section label {
  font-weight: 500;
}

#codeEditor {
  width: 100%;
  min-height: 200px;
  padding: 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid #e5e7eb;
  font-family: monospace;
  font-size: 0.75rem;
}

.tip {
  font-size: 0.75rem;
  color: #4b5563;
  padding-top: 0.5rem;
  margin-bottom: 1rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.abc{
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 20px;
}

.blue-btn {
  background-color: rgb(44 153 206);
  padding: .5rem .9rem;
  border-radius: 999px;
  border: none;
  color:white;
  cursor:pointer;
  box-shadow: 0 6px 18px rgba(2,6,23,0.08);
  transition: transform .12s ease, background-color .12s ease, box-shadow .12s;
  font-weight:600;
}

.blue-btn:disabled {
  background-color: #9ca3af;
  cursor: not-allowed;
  box-shadow: none;
  opacity: 0.7;
}


.blue-btn:hover { background-color: #1e3a8a; }

.red-btn {
  background-color: #ef4444;
  padding: .5rem .9rem;
  border-radius: 999px;
  border: none;
  color:white;
  cursor:pointer;
  box-shadow: 0 6px 18px rgba(2,6,23,0.08);
  transition: transform .12s ease, background-color .12s ease, box-shadow .12s;
  font-weight:600;
}

.red-btn:hover {
  background-color: #dc2626;
}

.yellow-btn {
  background-color: #f59e0b;
  padding: .5rem .9rem;
  border-radius: 999px;
  margin-right: 10px;
  border: none;
  color:white;
  cursor:pointer;
  box-shadow: 0 6px 18px rgba(2,6,23,0.08);
  transition: transform .12s ease, background-color .12s ease, box-shadow .12s;
  font-weight:600;
}

.yellow-btn:hover {
  background-color: #d97706;
}

.popup {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 50;
}

.popup-content {
  background: white;
  padding: 0.5rem 1rem;
  border-radius: 1rem;
  max-width: 500px;
  width: 90%;
  max-height: 83vh;
  overflow: auto;
  position: relative;
}

.heading{
  margin: 10px 0px 3px 0px;
  font-size: large;
}

.popup-content.large { max-width: 800px; }

.popup-buttons { margin-top: 1rem; display: flex; justify-content: flex-end; gap: 0.5rem; }

.graph-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 15px;
    overflow-x: auto;
    border: 1px solid #d1d5db;
    background: white;
    font-family: monospace;
    border-radius: 0.5rem;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  background: #1f2937;
  color: white;
  padding: 0.75rem;
  font-weight: bold;
  font-size: 0.75rem;
}

.diagram-container img {
  max-height: 60vh;
  border-radius: 0.5rem;
  border: 1px solid #d1d5db;
  display: block;
  margin: auto;
  max-width:100%;border-radius:8px;
}

.diagram-container p{
    text-align: center;
}

.click-info {
  margin-top: 0.5rem;
  color: #1d4ed8;
}