body {
    font-family: system-ui, Arial;
    background: #f4f4f4;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.card {
    background: white;
    padding: 30px;
    width: 320px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 20px;
}

input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 15px;
}

button {
    width: 100%;
    padding: 10px;
    background: #2b67f6;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    opacity: 0.9;
}

.switch {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: #333;
    cursor: pointer;
}

.switch span {
    color: #2b67f6;
}

.popup-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* ==== Loader ==== */

.loader {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #0000ff;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite
}

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