body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

button:hover {
    background-color: #0056b3;
}

.error {
    color: #dc3545;
    background-color: #f8d7da;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.header {
    background: #fff;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header h2 {
    margin: 0;
}

.logout-btn {
    text-decoration: none;
    background-color: #dc3545;
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
}

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

.gallery-container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.photo-item {
    background: #fff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.photo-item:hover {
    transform: scale(1.05);
}

.photo-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 4px;
    display: block;
    cursor: pointer;
}

/* Modal / Lightbox Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    align-items: center;
    justify-content: center;
}

.modal-content {
    max-width: 90%;
    max-height: 90vh;
    border-radius: 4px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.5);
    animation-name: zoom;
    animation-duration: 0.3s;
}

@keyframes zoom {
    from {transform:scale(0)} 
    to {transform:scale(1)}
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.close-btn:hover,
.close-btn:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* Mobile Responsive Styles */
@media screen and (max-width: 768px) {
    .login-container {
        margin: 40px 20px;
        padding: 20px;
    }

    .header {
        flex-direction: column;
        text-align: center;
        padding: 15px 20px;
        gap: 15px;
    }

    .gallery-container {
        margin: 20px auto;
        padding: 0 15px;
    }

    .photo-grid {
        /* Allow smaller columns on phones so at least two images can show side-by-side or fill screen completely */
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 15px;
    }

    .photo-item img {
        height: 140px; /* Adjust height for smaller grids */
    }

    .modal-content {
        max-width: 95%;
        max-height: 80vh; 
    }
    
    .close-btn {
        top: 10px;
        right: 15px;
        font-size: 35px;
    }
}