* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #f4f4f4;
    font-family: Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Center container */
.container {
    width: 100%;
    max-width: 380px;
    margin: 80px auto;
    background: #fff;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

/* Heading */
h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.4rem;
}

/* Inputs */
input {
    width: 100%;
    padding: 12px;
    margin: 12px 0;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 1rem;
}

/* Button */
button {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

/* Loading Overlay */
#loadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #ddd;
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

#loadingOverlay p {
    color: #fff;
    margin-top: 10px;
    font-size: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Tablet */
@media (min-width: 600px) {
    .container {
        margin-top: 100px;
    }
}

/* Desktop */
@media (min-width: 992px) {
    .container {
        margin-top: 120px;
    }
}