body {
    font-family: 'Pretendard', sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    width: 100%;
    max-width: 500px;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

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

.tab-container {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    justify-content: center;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: #eee;
    cursor: pointer;
    font-weight: 600;
    transition: 0.3s;
}

.tab-btn.active {
    background: #007bff;
    color: white;
}

#mode-desc {
    text-align: center;
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 25px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-sizing: border-box;
}

.calc-btn {
    width: 100%;
    padding: 15px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}

.result-box {
    margin-top: 25px;
    padding: 20px;
    background: #f8f9fa;
    border-left: 5px solid #28a745;
    border-radius: 8px;
}

.tax-info {
    font-size: 0.9rem;
    color: #dc3545;
    margin-top: 10px;
    border-top: 1px solid #ddd;
    padding-top: 10px;
}

.info-section {
    margin-top: 30px;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #555;
}