body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1A1A1A;
    color: #EFEFEF;
    line-height: 1.6;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}
header {
    background-color: #1A1A1A;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    border-bottom: 1px solid #333;
}
header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}
.logo {
    font-size: 2em;
    font-weight: bold;
    color: #00CED1;
    text-decoration: none;
}
nav a {
    color: #EFEFEF;
    text-decoration: none;
    margin-left: 25px;
    font-size: 1.1em;
}
main {
    padding-top: 80px;
}
h1, h2, h3 {
    color: #00CED1;
    font-weight: 300;
}
h1 { font-size: 2.5em; text-align: center; }
h2 { font-size: 2em; margin-top: 40px; }
h3 { font-size: 1.5em; }
p, ul {
    color: #BBBBBB;
}
ul {
    padding-left: 20px;
}
li {
    margin-bottom: 10px;
}
footer {
    background-color: #1A1A1A;
    color: #EFEFEF;
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid #333;
}
footer .container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
}
.footer-col {
    flex: 1;
    margin: 20px;
    min-width: 250px;
    text-align: left;
}
.footer-col h3 {
    color: #00CED1;
    margin-bottom: 15px;
    font-size: 1.4em;
}
.footer-col p {
    margin: 5px 0;
    color: #BBBBBB;
}
.footer-col a {
    color: #EFEFEF;
    text-decoration: none;
    display: block;
    margin-bottom: 10px;
}
@media (max-width: 768px) {
    footer .container {
        flex-direction: column;
        align-items: center;
    }
    .footer-col {
        text-align: center;
    }
}