body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

.navbar {
    margin-bottom: 20px;
    background-color: #f8f9fa;
    transition: background-color 0.3s, color 0.3s;
}

.navbar .nav-link, .navbar .navbar-brand {
    color: #333 !important;
}

.container {
    max-width: 800px;
    margin: auto;
    padding: 20px;
}

h1 {
    font-size: 2.5rem;
    margin: 0.5rem 0;
}

.card {
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

.card-header h2 {
    margin: 0;
}

.dropzone {
    border: 2px dashed #007bff;
    padding: 20px;
    border-radius: 5px;
    text-align: center;
    background: white;
    transition: background 0.3s;
}

.dark-mode .dropzone {
    background: #444;
    border-color: #666;
}

.list-group-item {
    display: flex;
    align-items: center;
}

.list-group-item i {
    margin-right: 10px;
}

.btn-sm i {
    margin-right: 0;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
    margin-right: 10px;
}

.switch input {
    display: none;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    z-index: 2;
}

input:checked + .slider {
    background-color: #007bff;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.slider i {
    position: absolute;
    width: 26px;
    height: 26px;
    top: 4px;
    color: black;
    line-height: 26px;
    text-align: center;
    z-index: 3;
}

.slider .fa-sun {
    left: 4px;
}

.slider .fa-moon {
    right: 4px;
    opacity: 0;
}

input:checked + .slider .fa-sun {
    opacity: 0;
}

input:checked + .slider .fa-moon {
    opacity: 1;
}

.dark-mode {
    background-color: #222;
    color: #f4f4f4;
}

.dark-mode .card {
    background: #333;
    border: 1px solid #444;
}

.dark-mode .list-group-item {
    background: #444;
    border: 1px solid #555;
}

.dark-mode .btn {
    color: #333;
}

.dark-mode .btn-primary {
    background: #007bff;
    border-color: #007bff;
}

.dark-mode .btn-danger {
    background: #dc3545;
    border-color: #dc3545;
}

.dark-mode .btn-warning {
    background: #ffc107;
    border-color: #ffc107;
}

.dark-mode .btn-outline-dark {
    color: #000000;
    border-color: #000000;
}

.dark-mode .btn-outline-primary {
    color: #007bff;
    border-color: #007bff;
}

.dark-mode .modal-content {
    background: #333;
    color: #f4f4f4;
}

.dark-mode .modal-header {
    border-bottom: 1px solid #444;
}

.dark-mode .modal-footer {
    border-top: 1px solid #444;
}

.dark-mode-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
}

.watermark {
    font-size: 0.8rem;
    color: #666;
}

.watermark p {
    margin: 0;
}

body.dark-mode .watermark {
    color: #bbb;
}