:root {
    --primary-color: #4a6fa5;
    --secondary-color: #3a5a8c;
    --accent-color: #ff7e5f;
    --light-color: #f8f9fa;
    --dark-color: #2b2d42;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
    padding: 20px;
}

.calculator-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

h1 i {
    margin-right: 10px;
}

.input-section {
    background: var(--light-color);
    padding: 25px;
    border-radius: var(--border-radius);
    margin-bottom: 30px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

input[type="number"], select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
}

input[type="number"]:focus, select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.2);
}

.input-with-currency {
    display: flex;
    align-items: center;
}

.input-with-currency select {
    width: 100px;
    border: 1px solid #ddd;
    border-right: none;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    background: white;
    font-size: 14px;
    cursor: pointer;
    padding: 12px 8px;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px;
}

.input-with-currency input {
    flex: 1;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    padding-left: 15px;
}

button {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

button:hover {
    background-color: var(--secondary-color);
}

.results-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.result-card {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--primary-color);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.result-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 16px;
}

.result-card p {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-color);
}

.work-hours-card {
    background-color: rgba(74, 111, 165, 0.1);
    border: 1px solid var(--primary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .results-section {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 15px;
    }
    
    .results-section {
        grid-template-columns: 1fr;
    }
    
    .input-with-currency select {
        width: 90px;
    }
}