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

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

.currency-selector {
    margin-bottom: 20px;
    text-align: center;
}

.currency-selector select {
    padding: 5px;
    font-size: 16px;
}

.section {
    margin-bottom: 30px;
}

h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    border-bottom: 2px solid #3498db;
    padding-bottom: 5px;
}

.expense-category {
    margin: 20px 0;
}

h3 {
    color: #3498db;
    margin-bottom: 10px;
    cursor: pointer;
}

.input-group {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    padding: 10px;
}

input[type="number"] {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 100%;
    font-size: 14px;
}

input[type="number"]:focus {
    border-color: #3498db;
    outline: none;
}

button {
    padding: 10px 20px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin: 5px;
    font-size: 16px;
}

button:hover {
    background-color: #27ae60;
}

#reset {
    background-color: #e74c3c;
}

#reset:hover {
    background-color: #c0392b;
}

.results {
    margin-top: 30px;
    text-align: center;
}

.result-display {
    margin-top: 20px;
    padding: 15px;
    background-color: #ecf0f1;
    border-radius: 4px;
    display: inline-block;
    width: 100%;
    max-width: 400px;
}

.result-display p {
    margin: 10px 0;
    font-size: 16px;
}

.result-display span {
    font-weight: bold;
    color: #2c3e50;
}

@media (max-width: 600px) {
    .input-group {
        grid-template-columns: 1fr;
    }
}