@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

:root {
  --blue: #4da6ff;
  --green: #81c784;
  --yellow: #ffd23f;
  --orange: #ff914d;
  --purple: #b57aff;
  --red: #ff4d6d;
  --bg: linear-gradient(120deg, #4fc3f7, #81c784);
}

/* === Base Layout === */
body {
  font-family: "Poppins", sans-serif;
  background: var(--bg);
  color: #222;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background 0.8s ease;
}

/* === Container Card === */
.container {
  background: #fff;
  padding: 2rem 3rem;
  border-radius: 16px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.25);
  text-align: center;
  max-width: 420px;
  width: 90%;
  animation: fadeIn 0.6s ease-out;
}

/* === Headings === */
h1 {
  color: var(--green);
  margin-top: 0;
  font-size: 2rem;
}

p.intro-text {
  color: #444;
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

/* === Category Buttons === */
#categoryButtons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

#categoryButtons button {
  border: none;
  color: white;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  transition: transform 0.2s, background 0.3s;
}

#categoryButtons button:hover {
  transform: scale(1.05);
}

/* Individual colors */
button[data-cat="days"] { background: #ffcf40; color: #333; }
button[data-cat="months"] { background: var(--purple); }
button[data-cat="numbers"] { background: var(--blue); }
button[data-cat="letters"] { background: var(--green); color: #333; }
button[data-cat="colors"] { background: var(--orange); }
button[data-cat="weekly"] { background: var(--red); }

/* === Lesson Screen === */
#lessonScreen {
  animation: popIn 0.4s ease;
}

.word-display {
  margin: 1.5rem 0;
}

.word {
  font-size: 1.8rem;
  font-weight: 600;
}

.french {
  color: var(--blue);
}

.feedback {
  font-size: 1.1rem;
  margin-top: 1rem;
  font-weight: 600;
  min-height: 24px;
}

/* === Lesson Buttons === */
.lesson-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lesson-controls button {
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  margin: 5px 0;
  font-size: 1rem;
  width: 80%;
  cursor: pointer;
  transition: background 0.3s;
}

.lesson-controls button:hover {
  background: #0d47a1;
}

#backBtn {
  background: #777;
}

#backBtn:hover {
  background: #444;
}

/* === State === */
.hidden { display: none; }
.visible { display: block; }

/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}