/* Pengaturan Dasar */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100-vh;
    padding: 20px;
}

/* Wadah Utama */
.container {
    width: 100%;
    max-width: 400px;
}

/* Kartu Form */
.card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
}

h2 {
    color: #1a73e8;
    margin-bottom: 10px;
}

p {
    color: #5f6368;
    font-size: 0.9rem;
    margin-bottom: 25px;
}

/* Input Group */
.input-group {
    text-align: left;
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #3c4043;
}

input[type="number"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #dadce0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #1a73e8;
}

/* Tombol */
.btn-cek {
    width: 100%;
    background-color: #1a73e8;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-cek:hover {
    background-color: #1557b0;
}

/* Footer */
.footer {
    margin-top: 25px;
    font-size: 0.75rem;
    color: #9aa0a6;
}

/* Responsif untuk layar sangat kecil */
@media (max-width: 320px) {
    .card {
        padding: 20px;
    }
}