button {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.15s;
}
button:hover { opacity: 0.85; }

#numpad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  width: 368px;
}

.num-btn {
  padding: 12px 0;
  background: var(--bg2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1.2rem;
  font-weight: 700;
}
.num-btn:hover { background: var(--bg3); }

.action-btn {
  padding: 10px 0;
  background: var(--bg2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.action-btn:hover        { background: var(--bg3); }
.action-btn svg          { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.action-btn.notes-active { background: var(--note-col); color: var(--bg); border-color: var(--note-col); }
.action-btn.disabled     { opacity: 0.3; cursor: default; }

#message {
  min-height: 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--msg-col);
  text-align: center;
}

#status-bar {
  display: flex;
  gap: 12px;
  font-size: 1rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

#difficulty-label {
  color: var(--accent);
  font-weight: 600;
}