/* ============================================================
   LESSON STYLES — стили для обучающей системы
   Цвета только через var(--…): читаемо и в светлой, и в тёмной теме.
   ============================================================ */

.lesson-view {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.lesson-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.lesson-header h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  color: var(--text);
}

.lesson-progress {
  font-size: 14px;
  color: var(--muted);
}

.btn-back {
  background: transparent;
  border: none;
  color: var(--accent-ink);
  font-size: 16px;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background 0.2s;
}

.btn-back:hover {
  background: var(--accent-soft);
}

/* Прогресс-бар */
.lesson-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--surface-3);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 30px;
}

.lesson-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  transition: width 0.3s ease;
}

/* Контент урока */
.lesson-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 24px;
  min-height: 300px;
}

.lesson-step-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 16px 0;
}

.lesson-text {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-2);
  margin-bottom: 20px;
}

.lesson-text strong {
  color: var(--text);
  font-weight: 600;
}

/* EXPLANATION */
.lesson-explanation {
  animation: fadeIn 0.3s ease;
}

/* FOCUS */
.lesson-focus {
  animation: fadeIn 0.3s ease;
}

/* FOCUS-доска и токены полностью живут в css/styles.css
   (.lesson-board / .lesson-token): здесь их не дублируем, чтобы не было
   двух конкурирующих шрифтов и отступов. */

/* ACTION */
.lesson-action {
  animation: fadeIn 0.3s ease;
}

.lesson-input-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.lesson-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lesson-field label {
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}

.lesson-input-area input {
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 16px;
  color: var(--text);
  transition: border-color 0.2s;
}

.lesson-input-area input:focus {
  outline: none;
  border-color: var(--accent);
}

.lesson-input-area input::placeholder {
  color: var(--muted);
}

.lesson-input-area button {
  align-self: flex-start;
}

/* FEEDBACK */
.lesson-feedback {
  animation: fadeIn 0.3s ease;
  padding: 20px;
  border-radius: 8px;
  border-left: 4px solid;
}

.lesson-feedback.tone-success {
  background: var(--success-soft);
  border-color: var(--success);
  color: var(--success-ink);
}

.lesson-feedback.tone-neutral {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text-2);
}

/* Inline feedback */
.lesson-feedback-inline {
  padding: 12px 16px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 500;
  animation: slideIn 0.3s ease;
}

.lesson-feedback-inline.correct {
  background: var(--success-soft);
  color: var(--success-ink);
  border: 1px solid var(--success);
}

.lesson-feedback-inline.incorrect {
  background: var(--danger-soft);
  color: var(--danger-ink);
  border: 1px solid var(--danger);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Подсказки */
.lesson-hint-section {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-hint {
  background: transparent;
  border: 1px solid var(--warn-ink);
  color: var(--warn-ink);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  align-self: flex-start;
}

.btn-hint:hover {
  background: var(--warn-soft);
}

.lesson-hint-box {
  background: var(--warn-soft);
  border: 1px solid var(--warn);
  border-left: 3px solid var(--warn-ink);
  border-radius: 8px;
  padding: 16px;
  color: var(--warn-ink);
  font-size: 14px;
  line-height: 1.5;
  animation: fadeIn 0.3s ease;
}

.lesson-solution-box {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 16px;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.5;
  animation: fadeIn 0.3s ease;
}

.lesson-solution-box strong {
  color: var(--text);
}

/* Навигация */
.lesson-navigation {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.lesson-navigation button {
  flex: 1;
  max-width: 200px;
}

/* Анимации */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .lesson-view {
    padding: 16px;
  }

  .lesson-content {
    padding: 20px;
  }

  .lesson-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .lesson-navigation {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 16px;
    z-index: 100;
  }

  .lesson-navigation button {
    max-width: none;
  }

  .lesson-view {
    padding-bottom: 80px;
  }
}

/* Task card в INDEPENDENT_TASK */
.lesson-independent .task-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-top: 16px;
}

.lesson-independent .task-text {
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 16px;
}