.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius-sm); border: none;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.15s; text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--bg); color: var(--text); border: 2px solid var(--border); }
.btn-secondary:hover { background: var(--border-light); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-lg { padding: 14px 32px; font-size: 17px; width: 100%; }
.btn-sm { padding: 8px 14px; font-size: 13px; }

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-secondary); margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 12px 14px; border: 2px solid var(--border);
  border-radius: var(--radius-sm); font-size: 15px;
  background: var(--surface); color: var(--text);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { outline: none; border-color: var(--primary); }

.option-label {
  display: flex; align-items: flex-start; gap: 10px; padding: 10px 14px;
  border: 2px solid var(--border); border-radius: var(--radius-sm); cursor: pointer;
  transition: all 0.15s;
}
.option-label:hover { border-color: var(--primary); background: var(--primary-light); }
.option-label input[type="radio"] { margin-top: 2px; }
.option-label.selected { border-color: var(--primary); background: var(--primary-light); }
.option-label.correct-option { border-color: var(--success); background: #f0fdf4; }

.practice-answer {
  margin-top: 12px; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 14px;
  border-left: 4px solid;
}
.practice-answer.correct { background: #f0fdf4; border-color: var(--success); color: var(--success); }
.practice-answer.incorrect { background: #fef2f2; border-color: var(--danger); color: var(--danger); }