body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    width: 50%;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
}

nav {
    text-align: center;
    margin-bottom: 20px;
}

nav button {
    padding: 10px 20px;
    margin: 5px;
    border: none;
    background-color: #007bff;
    color: #fff;
    cursor: pointer;
    border-radius: 5px;
    font-size: 16px;
}

nav button:hover {
    background-color: #0056b3;
}

.calculator {
    display: none;
}

.calculator.active {
    display: block;
}

.hidden {
    display: none;
}

label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
}

input, select {
    width: 95%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    width: 100%;
    padding: 15px;
    margin-top: 20px;
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #218838;
}

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

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 10px;
    text-align: center;
}

thead {
    background-color: #f8f8f8;
    font-weight: bold;
}

#basicResult, #dividendResult {
    margin-top: 20px;
    font-size: 18px;
    color: #333;
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .container {
        width: 75%;
    }

    nav button {
        font-size: 14px;
        padding: 8px 15px;
    }

    button {
        font-size: 14px;
        padding: 12px;
    }

    input, select {
        padding: 8px;
    }
}

@media (max-width: 768px) {
    .container {
        width: 90%;
    }

    nav {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    nav button {
        width: 100%;
        margin-bottom: 10px;
        font-size: 14px;
    }

    input, select, button {
        font-size: 14px;
        padding: 12px;
    }

    table, th, td {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        width: 100%;
        padding: 10px;
    }

    h1 {
        font-size: 1.5rem;
    }

    nav button {
        font-size: 12px;
        padding: 10px;
    }

    input, select, button {
        font-size: 12px;
        padding: 10px;
    }

    table, th, td {
        font-size: 11px;
    }

    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}