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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.calculator {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #333;
}

input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s;
    margin-top: 10px;
}

button:hover {
    transform: translateY(-2px);
}

.presets {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    text-align: center;
}

.presets h3 {
    margin-bottom: 20px;
    color: #333;
}

.presets button {
    margin: 5px;
    padding: 10px 20px;
    font-size: 14px;
}

.result {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    text-align: center;
}

.result h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.breakdown {
    display: flex;
    justify-content: space-around;
    margin-top: 15px;
}

.breakdown p {
    color: #666;
    font-size: 14px;
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    .calculator {
        padding: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }

    /* Mobile-friendly tweaks */
    .breakdown {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    input[type="number"], button {
        font-size: 1.125rem; /* 18px for easier tapping */
    }
}

.site-footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
}

.site-footer p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
}