body {
    margin: 0;
    font-family: Arial;
    background: #0f172a;
    color: white;
}

/* Header */
header {
    text-align: center;
    padding: 20px;
    font-size: 28px;
    color: #38bdf8;
    font-weight: bold;
}

/* Container */
.container {
    display: flex;
    justify-content: center;
    padding: 30px;
}

/* Card */
.card {
    background: #1e293b;
    padding: 25px;
    border-radius: 12px;
    width: 320px;
    animation: slide 0.8s ease;
}

@keyframes slide {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Inputs */
input {
    width: 90%;
    padding: 10px;
    margin: 8px 0;
    border-radius: 6px;
    border: none;
}

/* Button */
button {
    padding: 10px 15px;
    background: #38bdf8;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

/* Done message */
#done {
    display: none;
    margin-top: 10px;
    background: lightgreen;
    color: black;
    padding: 10px;
    border-radius: 6px;
}