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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

.calculator-box {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #666;
}

.tab-btn.active {
    color: #1890ff;
    border-bottom: 2px solid #1890ff;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input[type="number"],
select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.radio-group {
    display: flex;
    gap: 20px;
}

.calculate-btn {
    width: 100%;
    padding: 12px;
    background-color: #1890ff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.calculate-btn:hover {
    background-color: #40a9ff;
}

.result-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.result-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 20px 0;
}

.result-item {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 4px;
    text-align: center;
}

.result-item span:first-child {
    display: block;
    color: #666;
    font-size: 14px;
}

.result-item span:last-child {
    display: block;
    color: #1890ff;
    font-size: 20px;
    font-weight: bold;
    margin-top: 5px;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 500;
}

@media (max-width: 768px) {
    .result-summary {
        grid-template-columns: 1fr;
    }
}