.calc-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.calc-inputs {
    flex: 1;
    min-width: 300px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

.input-group input {
    width: 200px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.unit {
    margin-left: 10px;
    color: #888;
}

.btn-calc {
    background: #ff9800;
    color: white;
    width: 200px;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: 30px;
}

.btn-calc:hover {
    background: #f57c00;
}

.presets h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #666;
}

.preset-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.preset-btn {
    background: #f5f5f5;
    border: 1px solid #ddd;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    color: #333;
}

.preset-btn:hover {
    background: #e0e0e0;
}

.calc-results {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
}

.result-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #eee;
}

.result-label {
    font-size: 14px;
    color: #888;
    margin-bottom: 5px;
}

.result-value {
    font-size: 32px;
    font-weight: bold;
    color: #2196f3;
}

.result-desc {
    font-size: 12px;
    color: #aaa;
}