html, body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    background-color: #333;
    color: #eee;
}

#header, #preview, #timeline {
    position: absolute;
    left: 0;
    right: 0;
}

#header {
    top: 0;
    height: 3em;
    display: flex;
    flex-flow: row nowrap;
    align-items: center;
}

#preview {
    top: 3em;
    bottom: 100px;
}

#timeline {
    bottom: 0;
    height: 100px;
}

#header > * {
    height: 2em;
    margin: 0 0.5em;
    font-size: 1em;
    font-family: ArtifaktElement;
}

#header .title {
    height: auto;
}

.auth-btn {
    display: flex;
    align-items: center;
    background: transparent;
    border: 1px solid #fff;
    color: #fff;
    padding: 0.5em 1em;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s;
}

.auth-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.logout-btn {
    background: #ff4444;
    border: none;
    color: white;
    padding: 0.3em 0.8em;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.8em;
    margin-left: 0.5em;
}

.logout-btn:hover {
    background: #cc3333;
}

#user-info {
    display: flex;
    align-items: center;
    color: #fff;
}

#user-name {
    font-weight: bold;
    margin-right: 0.5em;
}