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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 10px;
    font-size: 2.5em;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1em;
}

.section {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.5em;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: 500;
}

.form-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
}

.info-box {
    background: #e3f2fd;
    border-left: 4px solid #667eea;
    padding: 15px;
    border-radius: 5px;
    margin-top: 15px;
}

.info-box strong {
    color: #667eea;
    display: block;
    margin-bottom: 8px;
}

.info-box ul {
    margin: 0;
    padding-left: 20px;
}

.info-box li {
    margin-bottom: 5px;
    color: #555;
}

.price {
    color: #667eea;
    font-weight: 600;
    font-size: 0.9em;
}

button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

.result {
    margin-top: 30px;
    padding: 20px;
    background: #f0f7ff;
    border-radius: 10px;
    border: 2px solid #667eea;
}

.result h2 {
    color: #667eea;
    margin-bottom: 15px;
}

#breakdown {
    margin-bottom: 20px;
}

.breakdown-item {
    padding: 10px;
    margin-bottom: 8px;
    background: white;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.breakdown-item.discount {
    color: #28a745;
    font-weight: 600;
}

.total {
    padding: 15px;
    background: #667eea;
    color: white;
    border-radius: 8px;
    text-align: center;
    font-size: 1.3em;
}

footer {
    text-align: center;
    color: white;
    margin-top: 30px;
    padding: 20px;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .checkbox-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .addon-qty {
        width: 100% !important;
        margin-top: 5px;
    }
}