* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 15px 0;
    margin-bottom: 30px;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 24px;
    color: #333;
}

header nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #666;
}

header nav a:hover {
    color: #333;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.image-item {
    position: relative;
    width: 140px;
    height: 140px;
    overflow: hidden;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-item.disabled::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover {
    background-color: #0056b3;
}

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

.btn-danger:hover {
    background-color: #c82333;
}

.btn-success {
    background-color: #28a745;
}

.btn-success:hover {
    background-color: #218838;
}

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

.group-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #eee;
}

.group-item:last-child {
    border-bottom: none;
}

.image-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 30px;
}

.image-card {
    position: relative;
    background-color: white;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    overflow: hidden;
}

.image-card img {
    width: 140px;
    height: 140px;
    object-fit: cover;
}

.image-card.disabled::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.image-card .actions {
    padding: 10px;
    display: flex;
    justify-content: space-between;
}

.login-form {
    max-width: 400px;
    margin: 50px auto;
    background-color: white;
    padding: 30px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.login-form h2 {
    text-align: center;
    margin-bottom: 20px;
}

.error {
    color: #dc3545;
    margin-bottom: 15px;
    text-align: center;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #28a745;
}

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

@media (max-width: 768px) {
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 20px;
    }
    
    .image-item {
        width: 120px;
        height: 120px;
    }
}