/* ============================================
   PenguinOS - Calculator App Styles
   ============================================ */

.calculator-app {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: #1a1a2e;
}

.calculator-app .window-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-md);
}

/* Mode toggle */
.calc-mode-toggle {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.calc-mode-btn {
    flex: 1;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    background: transparent;
    transition: all var(--transition-fast);
}

.calc-mode-btn:hover {
    background: var(--bg-hover);
}

.calc-mode-btn.active {
    background: var(--accent-primary);
    color: white;
}

/* Display */
.calc-display {
    background: #0f0f1a;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-end;
}

.calc-expression {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    min-height: 20px;
    word-break: break-all;
}

.calc-result {
    font-size: 32px;
    font-weight: 300;
    color: var(--text-primary);
    font-family: var(--font-mono);
    word-break: break-all;
}

.calc-result.error {
    color: var(--accent-danger);
    font-size: 18px;
}

/* History panel */
.calc-history {
    max-height: 100px;
    overflow-y: auto;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: #0f0f1a;
    border-radius: var(--border-radius);
}

.calc-history.hidden {
    display: none;
}

.calc-history-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.calc-history-item:hover {
    background: var(--bg-hover);
    border-radius: var(--border-radius);
}

.calc-history-expr {
    color: var(--text-muted);
}

.calc-history-result {
    color: var(--text-primary);
}

/* Button grid */
.calc-buttons {
    display: grid;
    gap: var(--spacing-sm);
    flex: 1;
}

.calc-buttons.basic {
    grid-template-columns: repeat(4, 1fr);
}

.calc-buttons.scientific {
    grid-template-columns: repeat(5, 1fr);
}

/* Buttons */
.calc-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    font-weight: 500;
    transition: all var(--transition-fast);
    background: #252538;
    color: var(--text-primary);
}

.calc-btn:hover {
    background: #2d2d45;
}

.calc-btn:active {
    transform: scale(0.95);
    background: #353550;
}

/* Number buttons */
.calc-btn.number {
    background: #2d2d45;
}

.calc-btn.number:hover {
    background: #353550;
}

/* Operator buttons */
.calc-btn.operator {
    background: #3a3a5a;
    color: var(--accent-primary);
}

.calc-btn.operator:hover {
    background: #454570;
}

/* Function buttons */
.calc-btn.function {
    background: #1f1f35;
    color: var(--text-secondary);
    font-size: var(--font-size-md);
}

.calc-btn.function:hover {
    background: #252545;
}

/* Equal button */
.calc-btn.equal {
    background: var(--accent-primary);
    color: white;
}

.calc-btn.equal:hover {
    background: var(--accent-secondary);
}

/* Clear buttons */
.calc-btn.clear {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-danger);
}

.calc-btn.clear:hover {
    background: rgba(239, 68, 68, 0.3);
}

/* Scientific buttons */
.calc-btn.scientific {
    font-size: var(--font-size-sm);
    background: #1a1a30;
    color: #80cbc4;
}

.calc-btn.scientific:hover {
    background: #202040;
}

/* Span multiple columns */
.calc-btn.span-2 {
    grid-column: span 2;
}

/* Memory buttons */
.calc-btn.memory {
    font-size: var(--font-size-sm);
    background: #1a1a30;
    color: #ffab91;
}

.calc-btn.memory:hover {
    background: #202040;
}

/* Button text variations */
.calc-btn sup {
    font-size: 0.6em;
    vertical-align: super;
}

.calc-btn sub {
    font-size: 0.6em;
    vertical-align: sub;
}

/* Keyboard focus indicator */
.calc-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Responsive font sizes */
@media (max-height: 500px) {
    .calc-btn {
        padding: var(--spacing-sm);
        font-size: var(--font-size-md);
    }

    .calc-result {
        font-size: 24px;
    }
}