/* board_table.css */
@import url('https://fonts.googleapis.com/css2?family=Jaro:opsz@6..72&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap'); /* Added Roboto for better readability */

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

body {
    font-family: "Roboto", "Jaro", sans-serif; /* Roboto first, Jaro as fallback */
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
    line-height: 1.6;
    color: #333; /* Default text color */
}

/* --- Navigation Bar --- */
nav {
    background: #0082e6; /* Your blue color */
    height: 80px;
    width: 100%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky; /* Make nav sticky */
    top: 0;
    z-index: 1000;
}

label.logo {
    color: white;
    font-size: 30px; /* Adjusted size */
    line-height: 80px;
    padding: 0 50px; /* Adjusted padding */
    font-weight: bold;
    font-family: "Jaro", serif; /* Keep Jaro for logo if desired */
}

nav ul {
    float: right;
    margin-right: 20px;
    list-style: none;
}

nav ul li {
    display: inline-block;
    line-height: 80px;
    margin: 0 8px; /* Slightly more margin */
}

nav ul li a {
    color: white;
    font-size: 16px; /* Adjusted size */
    padding: 10px 15px; /* Adjusted padding */
    border-radius: 4px;
    text-transform: uppercase;
    text-decoration: none;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-weight: 500;
}

nav ul li a.active,
nav ul li a:hover {
    background: #0066c4; /* Darker blue for hover/active */
    color: #fff;
}

.checkbtn {
    font-size: 28px; /* Adjusted size */
    color: white;
    float: right;
    line-height: 80px;
    margin-right: 40px;
    cursor: pointer;
    display: none; /* Hidden by default for larger screens */
}

#check {
    display: none; /* Hide the checkbox */
}

/* --- Main Section (Background) --- */
section {
    /* background: url('path/to/your/old-books-436498_1280.jpg') no-repeat center center fixed; */
    /* Note: Using fixed paths like C:/LMS project/old-books-436498_1280.jpg will not work on a web server. */
    /* Use a relative path or a URL. For now, I'll use a placeholder color. */
    background-color: #f4f7f6;
    background-size: cover;
    min-height: calc(100vh - 80px); /* Ensure it fills at least the viewport height minus nav */
    padding: 20px;
}

/* --- Leaderboard Specific Styles --- */
.leaderboard-header {
    text-align: center;
    margin-top: 20px;
    margin-bottom: 25px; /* Increased margin */
    font-size: 2.2em; /* Larger header */
    color: #2c3e50; /* Darker color */
    font-family: "Jaro", serif;
}
.leaderboard-header i {
    color: #f1c40f; /* Gold color for trophy */
    margin-right: 10px;
}

.controls {
    text-align: center;
    margin-bottom: 30px; /* Increased margin */
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex; /* Flex for better alignment */
    justify-content: center;
    align-items: center;
    flex-wrap: wrap; /* Allow wrapping on small screens */
    gap: 15px; /* Space between control items */
}
.controls label {
    margin-right: 5px;
    font-weight: 500;
    color: #555;
}
.controls select, .controls button {
    padding: 10px 15px; /* Increased padding */
    border-radius: 5px;
    border: 1px solid #ccc;
    margin-right: 10px;
    font-size: 0.95em;
}
.controls select {
    min-width: 150px; /* Give select some width */
}
.controls button {
    background-color: #007bff; /* Consistent blue */
    color: white;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s ease;
}
.controls button:hover {
    background-color: #0056b3; /* Darker blue on hover */
}
.controls button i {
    margin-right: 5px;
}


/* --- Leaderboard Table --- */
#leaderboardTableContainer {
    max-width: 800px; /* Max width for the table container */
    margin: 0 auto; /* Center the container */
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 10px 0; /* Padding for table inside */
    overflow-x: auto; /* Allow horizontal scroll on small screens if table is too wide */
}

table { /* Applies to the table inside #leaderboardTableContainer */
  border-collapse: collapse;
  width: 100%; /* Table takes full width of its container */
  margin: 0; /* Reset margin as container handles it */
}

th, td {
  border: 1px solid #e0e0e0; /* Lighter border */
  padding: 12px 15px; /* Increased padding */
  text-align: left;
  font-size: 0.95em;
}

th {
  background-color: #f0f2f5; /* Light background for header */
  color: #333;
  font-weight: 600; /* Bolder header text */
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tbody tr:nth-child(even) {
  background-color: #f9f9f9; /* Zebra striping */
}
tbody tr:hover {
  background-color: #e9eff5; /* Hover effect */
}

/* --- Loading and Error Messages --- */
.loading-spinner-container {
    text-align: center;
    padding: 50px;
    color: #555;
}
.loading-spinner {
    border: 5px solid #f0f0f0; /* Lighter grey */
    border-top: 5px solid #007bff; /* Blue */
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px auto; /* Center spinner */
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.error-message, 
#leaderboardTableContainer p[style*="text-align:center"] /* For "no data" messages */
{
    text-align: center;
    color: #d9534f; /* Red for errors */
    padding: 30px 20px;
    font-size: 1.1em;
    background-color: #fdf7f7;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    margin: 20px;
}
#leaderboardTableContainer p[style*="text-align:center"] { /* Style "no data" differently */
    color: #555;
    background-color: #f9f9f9;
    border-color: #eee;
}


/* --- Responsive Navigation (from your original CSS) --- */
@media (max-width: 952px) {
    label.logo {
        font-size: 28px; /* Adjusted */
        padding-left: 40px; /* Adjusted */
    }
    nav ul li a {
        font-size: 15px; /* Adjusted */
    }
}

@media (max-width: 858px) {
    .checkbtn {
        display: block;
    }
    nav ul { /* Target the ul specifically inside nav */
        position: fixed;
        width: 100%;
        height: calc(100vh - 80px); /* Full height minus nav */
        background: #2c3e50; /* Dark background for mobile menu */
        top: 80px; /* Position below nav */
        left: -100%; /* Off-screen initially */
        text-align: center;
        transition: all .5s ease; /* Smoother transition */
        padding-top: 20px;
    }
    nav ul li {
        display: block;
        margin: 30px 0; /* Adjusted margin */
        line-height: normal; /* Reset line height */
    }
    nav ul li a {
        font-size: 18px; /* Adjusted font size */
    }
    nav ul li a:hover,
    nav ul li a.active { /* Ensure mobile hover/active is distinct */
        background: none; /* Remove background */
        color: #00acee; /* Lighter blue for hover */
    }
    #check:checked ~ ul {
        left: 0; /* Slide in menu */
    }
}