/* Basic Calculator — extends global.css */

.bc-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  margin-bottom: 36px;
}

.bc-display {
  background: linear-gradient(135deg, #1a1a2e 0%, #3a3a5c 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 22px 20px;
  margin-bottom: 16px;
  min-height: 110px;
  display: flex; flex-direction: column; justify-content: flex-end;
  border: 1px solid var(--border);
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.25);
}
.bc-expr { font-size: 0.95rem; opacity: 0.75; min-height: 1.4em; word-wrap: break-word; text-align: right; }
.bc-result { font-size: 2.6rem; font-weight: 700; text-align: right; word-wrap: break-word; line-height: 1.1; }

.bc-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.bc-memory { gap: 6px; }
.bc-mem-indicator {
  background: var(--primary); color: #fff; border-radius: 50px;
  padding: 3px 10px; font-size: 0.78rem; font-weight: 700; margin-left: auto;
  align-self: center;
}

.bc-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.bc-btn {
  background: var(--bg-light);
  color: var(--text-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 10px;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font);
  transition: var(--transition);
  min-height: 60px;
}
.bc-btn:hover { background: #e9eef7; transform: translateY(-1px); }
.bc-btn:active { transform: translateY(0); background: #dde4ef; }
.bc-btn.bc-op { background: rgba(55,122,209,0.12); color: var(--primary); border-color: rgba(55,122,209,0.3); }
.bc-btn.bc-op:hover { background: var(--primary); color: #fff; }
.bc-btn.bc-fn { background: rgba(55,122,209,0.06); color: var(--text-mid); }
.bc-btn.bc-fn:hover { background: rgba(55,122,209,0.16); color: var(--primary); }
.bc-btn.bc-zero { grid-column: span 1; }
.bc-btn.bc-wide { grid-column: span 1; }
.bc-btn.bc-equals {
  background: var(--primary); color: #fff; border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(55,122,209,0.3);
}
.bc-btn.bc-equals:hover { background: var(--primary-dark); }

.bc-help { font-size: 0.82rem; color: var(--text-light); margin: 14px 0 0; text-align: center; }

/* History */
.bc-history { display: flex; flex-direction: column; }
.bc-hist-actions { display: flex; justify-content: flex-end; margin-bottom: 12px; }
.bc-hist-list { list-style: none; padding: 0; margin: 0; flex: 1; }
.bc-hist-item {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.92rem;
}
.bc-hist-item:hover { border-color: var(--primary); transform: translateX(-3px); }
.bc-hist-item .expr { color: var(--text-mid); }
.bc-hist-item .res { font-weight: 700; color: var(--primary); font-size: 1rem; }
.bc-hist-empty { color: var(--text-light); padding: 12px 0; font-size: 0.92rem; }

@media (max-width: 880px) {
  .bc-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .bc-result { font-size: 2.1rem; }
  .bc-btn { padding: 14px 6px; min-height: 54px; font-size: 1rem; }
}