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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

.tax-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 10px;
    flex-wrap: wrap;
}

.tax-nav li {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    transition: all 0.3s ease;
}

.tax-nav li:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.tax-nav li.active {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.tax-nav a {
    display: block;
    padding: 10px 20px;
    color: white;
    text-decoration: none;
    font-weight: 500;
    border-radius: 25px;
}

/* Main Content */
main {
    display: grid;
    gap: 30px;
}

.calculator-section {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.calculator-section h2 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}

.notice {
    background: #e3f2fd;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    border-left: 5px solid #2196f3;
}

.notice p {
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.notice p:last-child {
    margin-bottom: 0;
}

.calculator-form h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 30px;
    text-align: center;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
    font-size: 1rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group input {
    flex: 1;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #fafafa;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-group .unit {
    position: absolute;
    right: 15px;
    color: #666;
    font-weight: 500;
}

.select-group select {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    background: #fafafa;
    cursor: pointer;
    transition: all 0.3s ease;
}

.select-group select:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 40px;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #f5f5f5;
    color: #666;
    border: 2px solid #e0e0e0;
}

.btn-secondary:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

/* Result Section */
.result-section {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 2px solid #e0e0e0;
}

.result-section h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}

.result-card {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.highlight {
    background: rgba(255, 255, 255, 0.1);
    margin: 0 -30px;
    padding: 20px 30px;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: 700;
}

.result-item .label {
    font-weight: 500;
}

.result-item .value {
    font-weight: 600;
    font-size: 1.1rem;
}

.result-item.highlight .value {
    font-size: 1.4rem;
}

/* Info Section */
.info-section {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.info-section h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}

.info-content ul {
    list-style: none;
    padding-left: 0;
}

.info-content li {
    margin-bottom: 15px;
    padding-left: 20px;
    position: relative;
}

.info-content li:before {
    content: "•";
    color: #667eea;
    font-weight: bold;
    position: absolute;
    left: 0;
}

.info-content ul ul {
    margin-top: 10px;
    padding-left: 20px;
}

.info-content ul ul li {
    font-size: 0.95rem;
    color: #666;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: #666;
    margin-top: 40px;
    border-top: 1px solid #e0e0e0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tax-nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .tax-nav li {
        width: 100%;
        text-align: center;
    }
    
    .calculator-section,
    .info-section {
        padding: 25px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .result-item.highlight {
        text-align: center;
    }
    
    .result-item.highlight .label,
    .result-item.highlight .value {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .calculator-section h2,
    .info-section h3 {
        font-size: 1.5rem;
    }
    
    .calculator-form h3 {
        font-size: 1.3rem;
    }
    
    .input-group input,
    .select-group select {
        padding: 12px;
        font-size: 0.95rem;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 1rem;
    }
}