body {
    background-color: #0e0e0e;
    color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}
.avatar {
    width: 120px;
    border-radius: 50%;
    margin-bottom: 15px;
}
h1 {
    font-size: 1.8em;
    margin: 0;
}
.subtitle {
    font-size: 1.2em;
    color: #c0ffc0;
    margin: 5px 0;
}
.tagline {
    font-size: 1em;
    color: #999;
    margin-bottom: 20px;
}
.btn {
    display: block;
    background-color: #1f1f1f;
    color: #fff;
    padding: 14px;
    border: 1px solid #2f2f2f;
    margin: 10px 0;
    text-decoration: none;
    border-radius: 10px;
    transition: background 0.3s ease;
}
.btn:hover {
    background-color: #272727;
}
footer {
    margin-top: 30px;
    font-size: 0.95em;
    color: #aaa;
}