/* Calculator Styles */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    padding: 10px;
    background: #f9fafb;
}

.calculator {
    max-width: 240px;
    margin: 0 auto;
}

.calculator-display {
    width: 100%;
    padding: 10px 12px;
    font-size: 1em;
    text-align: right;
    background: white;
    border: 2px solid #d1d5db;
    border-radius: 6px;
    min-height: 38px;
    color: #1f2937;
    font-weight: 500;
    margin-bottom: 8px;
    word-break: break-all;
}

.calculator-result {
    width: 100%;
    padding: 8px 12px;
    font-size: 0.9em;
    text-align: right;
    background: #f0fdf4;
    border: 2px solid #86efac;
    border-radius: 6px;
    min-height: 34px;
    color: #15803d;
    font-weight: 600;
    margin-bottom: 12px;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

button {
    padding: 12px;
    font-size: 1em;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    color: #374151;
    background: white;
    border: 1px solid #d1d5db;
}

button:hover {
    background: #f3f4f6;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

button:active,
button.keyboard-pressed {
    transform: translateY(0);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.operator {
    background: #dbeafe;
    color: #1e40af;
    font-weight: 700;
}

.operator:hover {
    background: #bfdbfe;
}

.equals {
    background: #4f46e5;
    color: white;
    grid-column: span 2;
}

.equals:hover {
    background: #4338ca;
}

.clear {
    background: #fee2e2;
    color: #991b1b;
}

.clear:hover {
    background: #fecaca;
}