/* ================= BUTTON ================= */
.btn {
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-md);
  padding: 14px 24px;
  min-height: 48px;
  width: 100%;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
@media (min-width: 992px) { .btn { max-width: 320px; } }

.btn-primary { background: var(--color-blue); color: white; }
.btn-primary:disabled { background: var(--color-mid-gray); color: #eee; cursor: not-allowed; }
.btn-primary:active:not(:disabled) { transform: scale(0.97); }

.btn-accent { background: var(--accent-color); color: white; }
.btn-accent:active { transform: scale(0.97); }

.btn-secondary { background: var(--color-light-gray); color: var(--color-dark-gray); }
.btn-secondary:active { transform: scale(0.97); }

.btn-outline-danger {
  border: 2px solid var(--color-maroon); color: var(--color-maroon); background: transparent;
}

.btn-row { display: flex; gap: var(--space-sm); }
.btn-row .btn { flex: 1; }

/* ================= CARD ================= */
.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 4px 12px var(--color-shadow);
}
.card-accent-top { border-top: 4px solid var(--accent-color); }

/* ================= PROGRESS BAR ================= */
.progress-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--color-light-gray);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--color-blue);
  transition: width 0.4s ease;
}
.progress-bar-fill.accent { background: var(--accent-color); }

/* ================= BADGE / CHIP ================= */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  background: var(--color-light-gray);
  color: var(--color-dark-gray);
}
.badge-earned { background: var(--color-maroon); color: white; }
.badge-accent { background: var(--accent-color); color: white; }

/* ================= INPUT FIELD ================= */
.field { margin-bottom: var(--space-md); text-align: left; }
.field label {
  display: block; font-size: 13px; font-weight: 600;
  margin-bottom: 6px; color: var(--color-dark-gray);
}
.input-field, select.input-field {
  width: 100%; min-height: 48px; padding: 12px 16px;
  border: 1.5px solid var(--color-border); border-radius: 10px;
  font-size: 15px; background: white;
}
.input-field:focus { border-color: var(--color-blue); outline: none; box-shadow: 0 0 0 3px rgba(27,79,114,0.15); }
.input-field.error { border-color: var(--color-danger); }
.input-error-text { color: var(--color-danger); font-size: 13px; margin-top: 4px; }
.input-readonly { background: var(--color-light-gray); color: #777; }

textarea.input-field { min-height: 100px; resize: vertical; }
textarea.input-field.essay { min-height: 160px; }

/* ================= OPTION CARD (radio) ================= */
.option-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border); margin-bottom: 10px;
  cursor: pointer; transition: border-color 0.15s ease, background 0.15s ease;
  text-align: left; width: 100%; background: white;
}
.option-card.selected { border-color: var(--color-blue); background: #EAF1F7; }
.option-card:active { transform: scale(0.99); }
.option-letter {
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-light-gray); display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px; color: var(--color-dark-gray);
}
.option-card.selected .option-letter { background: var(--color-blue); color: white; }

/* ================= HEADER GLOBAL (course progress) ================= */
.app-header {
  position: sticky; top: 0; z-index: 10;
  background: white; padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.app-header-row {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: #777; margin-top: 6px;
}
.xp-chip { display: flex; align-items: center; gap: 6px; }
.badge-mini-row { display: flex; gap: 4px; font-size: 14px; }

/* ================= FEEDBACK BOX (checkpoint wrong answer, etc.) ================= */
.feedback-box {
  padding: var(--space-md); border-radius: var(--radius-md);
  background: #FDF3E7; border: 1px solid var(--color-warning);
  font-size: 14px; margin-bottom: var(--space-md);
}
.feedback-box.positive { background: #E9F7EF; border-color: var(--color-success); }