.auth-container {
    max-width: 400px;
    margin: 60px auto;
    background: #ffffff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    color: #1e293b;
}

/* Căn giữa nút Google Sign-In */
.google-btn-wrapper {
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    width: 100% !important;
    margin: 20px 0 !important;
}

/* Ép khung chứa và iframe của Google căn giữa */
.google-btn-wrapper .g_id_signin,
.google-btn-wrapper .g_id_signin > div,
.google-btn-wrapper iframe {
    margin: 0 auto !important;
    display: block !important;
}

.auth-msg {
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13.5px;
    text-align: center;
}
.auth-msg.error { background: #fee2e2; color: #dc2626; }
.auth-msg.success { background: #dcfce7; color: #16a34a; }

.back-home {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #64748b;
    font-size: 13.5px;
    text-decoration: none;
    transition: color 0.2s;
}
.back-home:hover { 
    color: #0284c7; 
}