body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

h1 {
    color: #8B0000;
    text-align: center;
    padding: 20px;
    margin: 0;
    background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    border-bottom: 3px solid #8B0000;
}

h2 {
    color: #2c3e50;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 10px;
    margin-top: 30px;
}

h3 {
    color: #34495e;
    margin-top: 20px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border: 2px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

a {
    color: #8B0000;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

a:hover {
    color: #CD5C5C;
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #2c3e50;
    color: white;
    margin-top: 40px;
}

/* Class Name Selectors */
.introduction {
    background-color: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.operations {
    background-color: #f9f9f9;
    padding: 20px;
    margin: 20px 0;
    border-left: 4px solid #8B0000;
}

.operation-name {
    font-weight: bold;
    color: #8B0000;
    margin-right: 10px;
}

.visual-section {
    background-color: white;
    padding: 30px;
    margin: 20px 0;
    text-align: center;
    border-radius: 8px;
}

.image-caption {
    font-style: italic;
    color: #666;
    text-align: center;
    margin-top: 10px;
}

.page-footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    border-top: 3px solid #8B0000;
}

/* ID Selectors */
#main-container {
    max-width: 1000px;
    margin: 0 auto;
    background-color: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

#properties-section {
    background-color: #fff5f5;
    padding: 25px;
    margin: 20px 0;
    border-radius: 8px;
    border: 1px solid #ffcccc;
}

#complexity-list {
    list-style-type: none;
    padding: 0;
    background-color: white;
    border-radius: 8px;
    padding: 20px;
}

#complexity-list li {
    padding: 10px;
    margin: 10px 0;
    background-color: #f8f8f8;
    border-left: 3px solid #8B0000;
    border-radius: 4px;
    transition: transform 0.2s ease;
}

#complexity-list li:hover {
    transform: translateX(5px);
    background-color: #f0f0f0;
}

#tree-diagram {
    padding: 20px;
    background-color: white;
    max-width: 500px;
}

#resources {
    background-color: #e8f5e9;
    padding: 25px;
    margin: 30px 0;
    border-radius: 8px;
    text-align: center;
}

/* Additional styling */
ol, ul {
    padding-left: 30px;
    line-height: 2;
}

ol li, ul li {
    margin: 8px 0;
}

p {
    margin: 15px 0;
    text-align: justify;
}