:root {
  --bg0b1324: #0b1324;
  --card111a33: #111a33;
  --texte5e7eb: #e5e7eb;
  --muted9aa4b2: #9aa4b2;
  --primary4f46e5: #4f46e5;
  --secondary334155: #334155;
  --success16a34a: #16a34a;
  --dangerdc2626: #dc2626;
  --borderrgba25525525508: rgba(255, 255, 255, 0.08);
  --bubbleUser1e293b: #1e293b;
  --bubbleAI0b142b: #0b142b;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #0b1324 0%, #0e1730 100%);
  color: var(--texte5e7eb);
  font-size: 16px;
  line-height: 1.5;
}

.container {
  width: min(920px, 100%);
  margin: auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

h1, h2 {
  margin: 6px 0 0 0;
  font-weight: 700;
}

h1 {
  font-size: 1.35rem;
  text-align: center;
}

h2 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.card {
  background-color: var(--card111a33);
  border: 1px solid var(--borderrgba25525525508);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
}

.file-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted9aa4b2);
}

input[type="file"], textarea, button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--borderrgba25525525508);
  padding: 10px;
  background-color: var(--bg0b1324);
  color: var(--texte5e7eb);
  font-size: 1rem;
}

button {
  font-weight: 600;
  cursor: pointer;
  background-color: var(--primary4f46e5);
  border: none;
  box-shadow: 0 2px 12px #18125035;
  padding: 12px 14px;
  transition: background-color 0.3s;
}

button:hover, button:focus {
  background-color: #3b288f;
  outline: none;
}

button:active {
  background-color: #221861;
}

.progress {
  width: 100%;
  height: 20px;
}

.row {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.quiz-container {
  display: grid;
  gap: 16px;
}

.q-card {
  background-color: #1e293b;
  padding: 12px;
  border-radius: 10px;
}

.q-title {
  font-weight: 600;
  margin-bottom: 10px;
}

.option {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  cursor: pointer;
}

.option input {
  cursor: pointer;
}

.small {
  font-size: 0.85rem;
  color: var(--muted9aa4b2);
}

.bubble {
  max-width: 80%;
  margin: 8px 0;
  padding: 12px 16px;
  border-radius: 20px;
  word-break: break-word;
}

.bubble.user {
  background-color: var(--bubbleUser1e293b);
  color: var(--texte5e7eb);
  align-self: flex-end;
}

.bubble.ai {
  background-color: var(--bubbleAI0b142b);
  color: var(--texte5e7eb);
  align-self: flex-start;
}

.chat-box {
  background: var(--card111a33);
  padding: 16px;
  border-radius: 16px;
  overflow-y: auto;
  max-height: 300px;
  margin-bottom: 8px;
}