body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f7f9fb;
  margin: 0;
  color: #222;
}
header {
  background: #2d3a4b;
  color: #fff;
  padding: 1.5rem 1rem 1rem 1rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}
#level-indicator {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}
main {
  max-width: 600px;
  margin: 2rem auto;
  padding: 1rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  scroll-margin-top: 100px;
}
#questions-container {
  margin-bottom: 2rem;
}
.question-block {
  background: #eaf1fb;
  border-radius: 8px;
  padding: 1.2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
button, .btn {
  background: #2d8cf0;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover, .btn:hover {
  background: #1a6fd1;
}
/* Boutons de niveaux inaccessibles (désactivés) */
#level-indicator .level-btn[disabled] {
  background: #b8c2cf;
  color: #eef2f7;
  cursor: not-allowed;
  opacity: 0.7;
}
/* Désactiver le hover pour les désactivés */
#level-indicator .level-btn[disabled]:hover {
  background: #b8c2cf;
}
#feedback-animation {
  min-height: 40px;
  text-align: center;
}
@media (max-width: 700px) {
  main {
    margin: 1rem;
    padding: 0.5rem;
  }
}
.level-icon {
  font-size: 1.5rem;
  vertical-align: middle;
  margin-right: 0.2em;
}
.level-label {
  font-size: 0.95rem;
  margin-left: 0.35em;
}
.level-icon-big {
  font-size: 2.2rem;
  vertical-align: middle;
  margin-right: 0.4em;
}
/* level-description removed */
.question-header {
  text-align: center;
  margin-bottom: 0.5em;
}
.question-code, .question-code code {
  font-family: 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', 'Liberation Mono', 'Courier New', monospace;
  font-size: 1.08em;
  font-weight: 500;
}
.question-success {
  background: #e6fae6 !important;
  border: 2px solid #4caf50 !important;
}
.question-fail {
  background: #ffeaea !important;
  border: 2px solid #e53935 !important;
  opacity: 0.85;
}
.encouragement {
  text-align: center;
  font-size: 1.1em;
  color: #2d8cf0;
  margin-bottom: 1.2em;
}
.answer-form {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-top: 1rem;
}
.answer-form input[type="text"] {
  flex-grow: 1;
  padding: 0.55rem 0.8rem;
  font-size: 1rem;
  border-radius: 6px;
  border: 2px solid #dcdcdc;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
.answer-form input[type="text"]:focus {
  border-color: #2d8cf0;
  box-shadow: 0 0 0 3px rgba(45, 140, 240, 0.2);
}