#difficulty-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 400;
  align-items: center;
  justify-content: center;
}
#difficulty-modal.open { display: flex; }

#difficulty-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 220px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

#difficulty-box h2 {
  font-size: 1.2rem;
  color: var(--accent);
  text-align: center;
  margin-bottom: 4px;
}

.diff-btn {
  padding: 12px;
  background: var(--bg3);
  color: var(--text);
  border: 2px solid transparent;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.diff-btn:hover  { background: var(--bg4); border-color: var(--accent); }
.diff-btn.active { border-color: var(--accent); color: var(--accent); }

#diff-cancel {
  padding: 8px;
  background: none;
  color: var(--text-dim);
  border: none;
  font-size: 0.85rem;
  font-weight: 400;
  margin-top: 4px;
}
#diff-cancel:hover { color: var(--text); opacity: 1; }