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

body {
    height: 100vh;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.calculator-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 400px;
    text-align: center;
    color: #fff;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
    color: #ddd;
}

.inputs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

input[type="number"] {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    border: none;
    font-size: 1rem;
    outline: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

button {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

button:hover {
    background-color: #45a049;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.result {
    font-size: 1.25rem;
    min-height: 1.5rem;
    color: #ffffff;
}