style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #fff;
}

.container {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 350px;
    backdrop-filter: blur(10px);
}

h2 {
    margin-bottom: 15px;
    font-size: 22px;
}

.input-group, .currency-group {
    margin-bottom: 15px;
}

input, select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
}

button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    background: #ff9800;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    font-weight: bold;
    color: #fff;
    transition: 0.3s;
}

button:hover {
    background: #e68900;
}

#swap {
    background: transparent;
    font-size: 20px;
    border: none;
    cursor: pointer;
    color: #fff;
    transition: 0.3s;
}

#swap:hover {
    transform: rotate(180deg);
}

.result {
    margin-top: 10px;
}

#result {
    text-align: center;
    font-size: 18px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    font-weight: bold;
}

@media (max-width: 400px) {
    .container {
        width: 90%;
    }
}