.calcform-calculator-wrapper {
  --cf-bg: #ffffff;
  --cf-fg: #111111;
  --cf-muted: #666666;
  --cf-border: rgba(0,0,0,0.12);
  --cf-btn-bg: rgba(0,0,0,0.04);
  --cf-btn-bg2: rgba(0,0,0,0.08);
  --cf-btn-fg: #111111;
  --cf-accent: #2b7cff;
  --cf-danger: #d63638;

  max-width: 420px;
  margin: 18px 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--cf-fg);
}

.calcform-calculator-wrapper.theme-dark {
  --cf-bg: #0f1216;
  --cf-fg: #e8eef7;
  --cf-muted: #a1a8b3;
  --cf-border: rgba(255,255,255,0.12);
  --cf-btn-bg: rgba(255,255,255,0.06);
  --cf-btn-bg2: rgba(255,255,255,0.12);
  --cf-btn-fg: #e8eef7;
  --cf-accent: #4da3ff;
  --cf-danger: #ff5b5e;
}

.calcform-calculator-wrapper.theme-auto {
  /* keep light defaults; allow system dark */
}
@media (prefers-color-scheme: dark) {
  .calcform-calculator-wrapper.theme-auto {
    --cf-bg: #0f1216;
    --cf-fg: #e8eef7;
    --cf-muted: #a1a8b3;
    --cf-border: rgba(255,255,255,0.12);
    --cf-btn-bg: rgba(255,255,255,0.06);
    --cf-btn-bg2: rgba(255,255,255,0.12);
    --cf-btn-fg: #e8eef7;
    --cf-accent: #4da3ff;
    --cf-danger: #ff5b5e;
  }
}

.calcform-calculator {
  background: var(--cf-bg);
  border: 1px solid var(--cf-border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 22px rgba(0,0,0,0.06);
}

.calcform-calculator-top {
  padding: 12px 12px 10px 12px;
  border-bottom: 1px solid var(--cf-border);
}

.calcform-calculator-mode {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.calcform-calculator-display {
  padding: 10px 10px;
  border: 1px solid var(--cf-border);
  border-radius: 12px;
  background: rgba(0,0,0,0.02);
}
.calcform-calculator-wrapper.theme-dark .calcform-calculator-display,
.calcform-calculator-wrapper.theme-auto .calcform-calculator-display {
  background: rgba(255,255,255,0.04);
}

.calcform-calculator-expression {
  min-height: 18px;
  font-size: 12px;
  color: var(--cf-muted);
  word-break: break-all;
}

.calcform-calculator-result {
  font-size: 28px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 0.2px;
  word-break: break-all;
}

.calcform-calculator-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 12px;
}

.calc-btn {
  appearance: none;
  border: 1px solid var(--cf-border);
  background: var(--cf-btn-bg);
  color: var(--cf-btn-fg);
  border-radius: 12px;
  padding: 12px 10px;
  font-weight: 650;
  cursor: pointer;
  user-select: none;
  transition: transform 0.04s ease, background 0.12s ease, border-color 0.12s ease;
}
.calc-btn:active {
  transform: translateY(1px);
  background: var(--cf-btn-bg2);
}
.calc-btn:focus {
  outline: 2px solid rgba(77,163,255,0.35);
  outline-offset: 2px;
}

.calc-btn-small {
  padding: 8px 10px;
  font-size: 12px;
}

.calc-btn-op {
  background: rgba(43,124,255,0.08);
  border-color: rgba(43,124,255,0.28);
}
.calcform-calculator-wrapper.theme-dark .calc-btn-op,
.calcform-calculator-wrapper.theme-auto .calc-btn-op {
  background: rgba(77,163,255,0.10);
  border-color: rgba(77,163,255,0.35);
}

.calc-btn-fn {
  font-weight: 650;
}

.calc-btn-mem {
  font-size: 12px;
  padding: 10px 8px;
}

.calc-btn-wide {
  grid-column: span 2;
}

.calc-btn-eq {
  background: rgba(43,124,255,0.18);
  border-color: rgba(43,124,255,0.45);
}
.calcform-calculator-wrapper.theme-dark .calc-btn-eq,
.calcform-calculator-wrapper.theme-auto .calc-btn-eq {
  background: rgba(77,163,255,0.20);
  border-color: rgba(77,163,255,0.55);
}

.calc-btn-danger {
  background: rgba(214,54,56,0.12);
  border-color: rgba(214,54,56,0.35);
}

.calcform-calculator-bottom {
  padding: 10px 12px 12px 12px;
  border-top: 1px solid var(--cf-border);
}

.calcform-calculator-hint {
  font-size: 12px;
  color: var(--cf-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.calc-kbd {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 8px;
  border: 1px solid var(--cf-border);
  background: rgba(0,0,0,0.03);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 11px;
  color: var(--cf-fg);
}

.calcform-calculator-history {
  margin-top: 10px;
  border: 1px solid var(--cf-border);
  border-radius: 14px;
  background: var(--cf-bg);
  overflow: hidden;
}

.calcform-calculator-history-title {
  padding: 10px 12px;
  border-bottom: 1px solid var(--cf-border);
  font-weight: 700;
}

.calcform-calculator-history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 220px;
  overflow: auto;
}

.calcform-calculator-history-list li {
  padding: 10px 12px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px solid var(--cf-border);
  cursor: pointer;
}
.calcform-calculator-history-list li:last-child { border-bottom: none; }
.calcform-calculator-history-list li:hover { background: rgba(0,0,0,0.03); }
.calcform-calculator-wrapper.theme-dark .calcform-calculator-history-list li:hover,
.calcform-calculator-wrapper.theme-auto .calcform-calculator-history-list li:hover { background: rgba(255,255,255,0.05); }

.calc-h-expr {
  font-size: 12px;
  color: var(--cf-muted);
  flex: 1 1 auto;
  word-break: break-all;
}
.calc-h-res {
  font-weight: 800;
  flex: 0 0 auto;
}