body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333; 
    margin: 0; 
}

#page {
    margin: 20px auto;
    width: 900px;
    background-color: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

header {
    background-color: #3f51b5;
    padding: 25px 0;
    text-align: center;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}

#logo {
    display: block;
    margin: 0 auto 25px; 
    max-width: 100%;
    height: auto;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex; 
    justify-content: center; 
}

nav li {
    margin: 0 8px; 
}

nav a {
    color: #fff; 
    background: #5c6bc0; 
    display: block;
    line-height: 1.0;
    padding: 14px 22px; 
    border-radius: 6px; 
    text-align: center;
    text-decoration: none; 
    transition: background 0.3s ease, transform 0.2s ease; 
}

nav a:hover {
    background: #7986cb; 
    transform: translateY(-2px); 
}

nav #current a {
    color: #3f51b5;
    background: #fff; 
    border: 1px solid #3f51b5; 
    cursor: default; 
}

#main {
    padding: 40px;
    min-height: 300px; 
}

h2 {
    font-size: 2.2em; 
    color: blue; 
    margin-bottom: 25px; 
    padding-bottom: 8px; 
    border-bottom: 3px solid #e0e0e0; 
    text-align: center;
}

h3, h4, h5, h6 {
    position: relative;
    margin-top: 35px; 
    margin-bottom: 15px;
    padding-left: 20px; 
    font-weight: bold;
    line-height: 1.3;
}

h3::before{
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 80%;
    background-color: #7986cb; 
    border-radius: 3px;
}

h3 {
    font-size: 1.5em;
    color: #424242;
}

p {
    line-height: 1.8; 
    margin-bottom: 20px; 
    padding: 0 10px; 
}

.profile-image {
    display: block;
    max-width: 80%; 
    height: auto;
    margin: 30px auto; 
    border: 3px solid #e0e0e0; 
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08); 
    border-radius: 8px; 
    transition: transform 0.3s ease; 
}

.profile-image:hover {
    transform: scale(1.02); 
}

footer {
    clear: both; 
    background-color: #e0e0e0; 
    padding: 20px 0; 
    text-align: center;
    border-bottom-left-radius: 10px; 
    border-bottom-right-radius: 10px; 
    color: #757575; 
}