/* --- Global Styles --- */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f4f8; /* Light blue-gray background */
    color: #333;
}

.container {
    max-width: 900px;
    margin: auto;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* --- Header and Logo Styles --- */
header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ddd;
}

.logo {
    width: 120px; /* Adjust size as needed */
    /* height: 60px; */
    margin-bottom: 20px;
}

h1 {
    color: #3f51b5; /* Blue theme color */
    font-size: 2.0em;
    margin: 0;
}

/* --- Table of Contents (index.html) Styles --- */
.container p {
    text-align: center;
    font-size: 1.1em;
    margin-bottom: 25px;
}

.container ul {
    list-style: none;
    padding: 0;
    max-width: 400px;
    margin: 0 auto;
}

.container li {
    margin: 10px 0;
    padding: 10px;
    background: #e8eaf6; /* Lighter blue background for list items */
    border-radius: 6px;
    transition: background 0.3s;
}

.container li:hover {
    background: #c5cae9;
}

.container a {
    text-decoration: none;
    color: #1a237e; /* Dark blue link color */
    font-size: 1.1em;
    display: block;
}

/* --- Video Embed Styles (video1.html, video2.html) --- */
.video-wrapper {
    margin-top: 20px;
    margin-bottom: 30px;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    position: relative;
    height: 0;
    overflow: hidden;
    background: black;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.back-link {
    display: block;
    margin-top: 20px;
    text-align: center;
    font-size: 1.1em;
    color: #3f51b5;
    text-decoration: none;
    padding: 8px;
    border: 1px solid #3f51b5;
    border-radius: 4px;
    max-width: 250px;
    margin: 20px auto 0;
    transition: background 0.3s;
}

.back-link:hover {
    background: #3f51b5;
    color: white;
}

.no-bullets-list {
  list-style-type: none;
  padding: 0; 
  margin: 0;
}