:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #27ae60;
    --warning-color: #e74c3c;
    --background-color: #f8f9fa;
    --border-color: #dee2e6;
    --text-color: #333;
}

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

.bolt-calculator-wrapper {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    padding: 10px;
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .calculator-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

.input-section, .results-section {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.input-section h1, .results-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.section-title {
    font-weight: bold;
    color: var(--primary-color);
    margin: 1.5rem 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.input-group {
    margin-bottom: 1rem;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.input-group input, .input-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.input-group input:invalid {
    border-color: var(--warning-color);
}

.unit-label {
    margin-left: 0.5rem;
    color: #666;
    font-style: italic;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.button-group button {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

#calculateBtn {
    background-color: var(--secondary-color);
    color: white;
}

#calculateBtn:hover:not(:disabled) {
    background-color: #2980b9;
}

#calculateBtn:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

#clearBtn {
    background-color: #95a5a6;
    color: white;
}

#clearBtn:hover {
    background-color: #7f8c8d;
}

/* Results Section */
.result-group {
    margin-bottom: 2rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.result-group h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
    border-bottom: none;
}

.recommendations {
    border-left: 4px solid var(--accent-color);
}

.recommendation-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    border-left: 3px solid var(--accent-color);
}

.recommendation-warning {
    border-left-color: var(--warning-color);
    background-color: #fdf2f2;
}

.toggle-btn {
    background: none;
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 1rem;
}

.toggle-btn:hover {
    background-color: var(--secondary-color);
    color: white;
}

.export-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.export-btn:hover {
    background-color: #219a52;
}

.empty-state {
    text-align: center;
    color: #666;
    font-style: italic;
    padding: 3rem;
}

.hidden {
    display: none;
}

/* Print Styles */
@media print {
    .input-section {
        display: none;
    }
    
    .calculator-container {
        grid-template-columns: 1fr;
    }
    
    .export-btn, .toggle-btn {
        display: none;
    }
    
    .bolt-calculator-wrapper {
        background: white;
    }
    
    .results-section {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

.input-group input:focus, .input-group select:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}