* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.calculator {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 500px;
}

.title {
    color: #2d3748;
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.5rem;
}

.input-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #4a5568;
    font-weight: 500;
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: #667eea;
}

.results {
    margin-top: 2rem;
    padding: 1rem;
    background: #f7fafc;
    border-radius: 8px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: white;
    border-radius: 6px;
}

.result-label {
    color: #4a5568;
    font-weight: 500;
}

.result-value {
    color: #2d3748;
    font-weight: 600;
}

button {
    width: 100%;
    padding: 0.75rem;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 1rem;
}

button:hover {
    background: #5a67d8;
}

@media (max-width: 480px) {
    .calculator {
        padding: 1rem;
    }
}