body {
    font-family: Arial, sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.main-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 400px;
}

h1 {
    font-size: 1.3rem;
    text-align: center;
    color: #333;
    margin: 0 0 5px 0;
}

.card {
    background: #ffffff;
    padding: 20px 25px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.card h2 {
    font-size: 1.05rem;
    color: #444;
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 8px;
}

.form-group {
    margin-bottom: 12px;
}

label {
    display: block;
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 4px;
}

input[type="number"] {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-group input {
    margin-right: 8px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #e63946;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 5px;
}

button:hover {
    background-color: #d62828;
}

.result-box {
    margin-top: 15px;
    padding: 10px;
    background: #f1faee;
    border-left: 4px solid #2a9d8f;
    font-size: 0.9rem;
    color: #333;
    display: none;
    word-break: break-word;
}