/* Element selector - styles all body elements */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    color: #333;
}

/* Element selector - styles all paragraph elements */
p {
    margin: 10px 0;
    font-size: 16px;
}

/* Element selector - styles all h2 elements */
h2 {
    color: #c41e3a;
    border-bottom: 2px solid #333;
    padding-bottom: 5px;
    margin-top: 25px;
}

/* Element selector - styles all h3 elements */
h3 {
    color: #555;
    margin-top: 20px;
}

/* Element selector - styles all unordered lists */
ul {
    background-color: #fff;
    padding: 20px 40px;
    border-left: 4px solid #c41e3a;
}

/* Element selector - styles all ordered lists */
ol {
    background-color: #fff;
    padding: 20px 40px;
    border-left: 4px solid #333;
}

/* Element selector - styles all list items */
li {
    margin: 8px 0;
}

/* Element selector - styles all links */
a {
    color: #c41e3a;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

/* Element selector - styles all images */
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border: 3px solid #333;
    border-radius: 8px;
}

/* ID selector - styles the main title */
#main-title {
    color: #fff;
    background: linear-gradient(135deg, #c41e3a 0%, #8b0000 100%);
    padding: 20px;
    text-align: center;
    border-radius: 10px;
    font-size: 36px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Class selector - styles the container */
.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

/* Class selector - styles introduction text */
.intro-text {
    font-size: 18px;
    line-height: 1.8;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 5px;
    border-left: 5px solid #c41e3a;
}

/* Class selector - styles the properties list */
.properties-list {
    list-style-type: square;
}

/* Class selector - styles the operations list */
.operations-list {
    list-style-type: decimal;
}

/* Class selector - styles highlighted content */
.highlight {
    background-color: #fffacd;
    padding: 15px;
    border-radius: 5px;
    border: 2px dashed #c41e3a;
    font-weight: 500;
}

/* Class selector - styles the image container */
.image-container {
    text-align: center;
    margin: 30px 0;
}

/* Class selector - styles image captions */
.caption {
    font-style: italic;
    color: #666;
    margin-top: 10px;
    font-size: 14px;
}