/* Basic Reset & Body Styles */
body {
    margin: 0; /* Removes default margin around the page */
    font-family: Arial, sans-serif; /* Sets a simple font */
    background-color: #f4f7f6; /* Light gray background */
    color: #333; /* Dark gray text color */
    line-height: 1.6; /* Spacing between lines of text */
}

/* Container for the main content */
.container {
    max-width: 960px; /* Maximum width of the content area */
    margin: 40px auto; /* Centers the container horizontally and adds top/bottom space */
    padding: 20px; /* Space inside the container */
    background-color: #ffffff; /* White background for the main content area */
    border-radius: 8px; /* Slightly rounded corners */
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); /* Subtle shadow */
}

/* Header Styles */
header {
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee; /* Light gray line at the bottom */
    margin-bottom: 30px;
}

header h1 {
    color: #2c3e50; /* Dark blue for the main heading */
    margin-bottom: 10px;
}

header p {
    color: #7f8c8d; /* Muted gray for the subheading */
    font-size: 0.9em;
}

/* Buttons */
button {
    background-color: #3498db; /* Blue background for buttons */
    color: white; /* White text */
    padding: 10px 20px; /* Space inside the button */
    border: none; /* No border */
    border-radius: 5px; /* Slightly rounded corners */
    cursor: pointer; /* Changes mouse cursor to a pointer on hover */
    font-size: 1em;
    transition: background-color 0.3s ease; /* Smooth transition for hover effect */
}

button:hover {
    background-color: #2980b9; /* Darker blue on hover */
}

/* Search Bar Styles */
.search-bar {
    display: flex; /* Arranges children (input, button) in a row */
    gap: 10px; /* Space between flex items */
    margin-bottom: 30px;
}

.search-bar input[type="text"] {
    flex-grow: 1; /* Allows the input to take up available space */
    padding: 10px;
    border: 1px solid #ccc; /* Light gray border */
    border-radius: 5px;
    font-size: 1em;
}

/* Document List Styles */
.document-list h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

#loading-message {
    text-align: center;
    font-style: italic;
    color: #7f8c8d;
    padding: 20px;
}

#documents-container {
    border: 1px solid #eee;
    border-radius: 5px;
    padding: 15px;
    background-color: #f9f9f9;
}

.document-item {
    background-color: #ffffff;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 15px; /* Space between document items */
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.document-item h3 {
    color: #34495e; /* Darker blue-gray for document titles */
    margin-top: 0;
    margin-bottom: 5px;
}

.document-item p {
    font-size: 0.9em;
    color: #555;
    margin-bottom: 5px;
}

.document-item .uploaded-date {
    font-size: 0.8em;
    color: #999;
    text-align: right;
    margin-top: 10px;
}

.document-item .actions {
    text-align: right;
    margin-top: 15px;
}

.document-item .actions button {
    padding: 8px 15px;
    font-size: 0.85em;
    margin-left: 10px;
}

.document-item .actions .delete-button {
    background-color: #e74c3c; /* Red for delete button */
}

.document-item .actions .delete-button:hover {
    background-color: #c0392b; /* Darker red on hover */
}

.document-item .actions .view-details-button {
    background-color: #9b59b6; /* Purple for view details */
}

.document-item .actions .view-details-button:hover {
    background-color: #8e44ad; /* Darker purple on hover */
}

/* --- Responsive Adjustments --- */

/* Styles for screens smaller than 768px (e.g., tablets and phones) */
@media screen and (max-width: 768px) {
    .container {
        margin: 20px; /* Reduce margin on smaller screens */
        padding: 15px; /* Reduce padding */
    }

    header h1 {
        font-size: 1.8em; /* Make header text smaller */
    }

    header p {
        font-size: 0.8em;
    }

    button {
        padding: 8px 15px; /* Slightly smaller buttons */
        font-size: 0.9em;
    }

    .search-bar {
        flex-direction: column; /* Stack input and button vertically */
        gap: 15px; /* Increase gap for vertical stacking */
    }

    .search-bar input[type="text"] {
        width: 100%; /* Make input take full width */
    }

    .document-item {
        padding: 10px; /* Reduce padding in document items */
    }

    .document-item .actions {
        text-align: center; /* Center action buttons */
        margin-top: 10px;
    }

    .document-item .actions button {
        margin: 5px; /* Add margin around buttons when stacked */
        display: block; /* Make buttons stack vertically */
        width: calc(100% - 10px); /* Adjust width to fit container with margin */
    }
}

/* Styles for screens smaller than 480px (e.g., small phones) */
@media screen and (max-width: 480px) {
    body {
        font-size: 0.9em; /* Make base font a bit smaller for very small screens */
    }

    header h1 {
        font-size: 1.5em;
    }

    .document-item h3 {
        font-size: 1.1em;
    }

    .document-item p {
        font-size: 0.8em;
    }
}