body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1, h2 {
    color: #2c3e50;
    text-align: center;
}

.input-section {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 6px;
}

.point-input {
    display: flex;
    margin-bottom: 10px;
    align-items: center;
}

.point-input label {
    min-width: 80px;
    margin-right: 10px;
}

.point-input input {
    width: 100px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.target-section {
    margin: 20px 0;
    padding: 15px;
    background-color: #f0f7ff;
    border-radius: 6px;
}

.target-section input {
    padding: 8px;
    width: 200px;
    border: 1px solid #b8daff;
    border-radius: 4px;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
}

.button-group button {
    padding: 10px 20px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.button-group button:hover {
    background-color: #0b7dda;
}

#calculate-btn {
    display: block;
    width: 200px;
    margin: 20px auto;
    padding: 12px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

#calculate-btn:hover {
    background-color: #45a049;
}

.result-section {
    padding: 20px;
    background-color: #e8f5e9;
    border-radius: 6px;
    text-align: center;
}

#result {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
}

.function-box {
    background-color: #e1f5fe;
    border-radius: 6px;
    padding: 15px;
    text-align: left;
    font-family: monospace;
    white-space: pre-wrap;
    overflow-x: auto;
}