@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap');
body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #4b79a1, #283e51);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #fff;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 12px;
    width: 320px;
    text-align: center;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

h2 {
    margin: 0 0 8px;
    font-size: 22px;
    font-weight: 600;
}

.subtext {
    font-size: 12px;
    margin-bottom: 18px;
    opacity: 0.8;
}

.input-group label {
    display: block;
    text-align: left;
    margin-bottom: 6px;
    font-weight: 500;
}

input[type="date"] {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: none;
    margin-bottom: 18px;
    font-size: 14px;
}

button {
    width: 100%;
    padding: 12px;
    border-radius: 6px;
    border: none;
    background: #1abc9c;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.25s;
}

button:hover {
    background: #16a085;
}

.output.hidden { display: none; }

.result-line {
    margin-top: 12px;
    font-size: 15px;
}