body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.container {
    max-width: 1000px;
    width: 100%;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    margin: 0 auto;
}
.logo {
    display: block;
    margin: 0 auto 20px;
    max-width: 150px;
}
h1 {
    text-align: center;
    color: #007bff;
}
form label {
    display: block;
    margin: 10px 0 5px;
}
form input, form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}
.send-it-btn {
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    padding: 20px 28px;
    transition: background-color 0.3s;
}
.send-it-btn:hover {
    background-color: #0056b3;
}
.send-it-btn .logo-img {
    max-width: 36px;
    margin-right: 12px;
}
.logo-img {
    max-width: 20px;
    margin-right: 10px;
    background-color: transparent !important;
}
.logo-img.sending {
    animation: spin 1s linear infinite;
    background-color: transparent !important;
}
#responseMessage {
    margin-bottom: 15px;
}
#responseMessage .success {
    color: green;
    font-weight: bold;
    background-color: #e6ffe6;
    padding: 15px;
    border: 2px solid green;
    border-radius: 4px;
    font-size: 16px;
}
#responseMessage .error {
    color: red;
    font-weight: bold;
    background-color: #ffe6e6;
    padding: 15px;
    border: 2px solid red;
    border-radius: 4px;
    font-size: 16px;
}
a {
    display: inline-block;
    margin-top: 10px;
    font-size: 14px;
}
.sending {
    background-color: #ccc;
    cursor: not-allowed;
}
.table-responsive {
    overflow-x: auto;
}
.table th, .table td {
    vertical-align: middle;
}
.image-button {
    cursor: pointer;
    border: 2px solid #007bff;
    border-radius: 4px;
    padding: 2px;
    transition: border-color 0.3s;
}
.image-button:hover {
    border-color: #0056b3;
}
.modal-body img {
    max-height: 300px;
    width: auto;
}
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}
@media (max-width: 576px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 15px;
    }
    form input, form textarea {
        font-size: 14px;
        padding: 8px;
    }
    .send-it-btn {
        font-size: 22px;
        padding: 18px 24px;
    }
    .send-it-btn .logo-img {
        max-width: 32px;
        margin-right: 10px;
    }
    .table {
        font-size: 12px;
    }
    .table img.image-button {
        width: 40px;
        height: 40px;
    }
    .modal-body img {
        max-height: 200px;
    }
    #responseMessage .success, #responseMessage .error {
        font-size: 14px;
        padding: 10px;
    }
}
@media (max-width: 576px) {
    #paint_items thead {
        display: none;
    }
    #paint_items tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid #ddd;
        padding: 0.5rem;
    }
    #paint_items td {
        display: block;
        text-align: left !important;
        position: relative;
        padding: 10px 0 10px 50% !important;
        border: none;
    }
    #paint_items td:before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        width: 45%;
        padding-right: 10px;
        white-space: nowrap;
        font-weight: bold;
        text-align: left;
    }
    #paint_items td .form-control, #paint_items td button {
        width: 100%;
    }
    #paint_items td:last-child {
        padding-top: 0;
    }
}