body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

main {
    flex: 1;
    padding: 1rem 2rem;
    max-width: 800px;
    margin: 20px auto;
    width: 90%;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    background: #fff;
    margin-bottom: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav ul li a {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: #333;
    transition: background-color 0.3s;
}

nav ul li a:hover {
    background-color: #e9e9e9;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background: #333;
    color: #fff;
    margin-top: auto;
}


.goback {
    display: block;
}

a.back {
    display: inline-block;
    font-size: 16px;
    border-radius: 6px;
    border: 1px solid #cfd6de;
    text-decoration: none;
    background-color: #f4fbff;
    color: #1f2d3a;
    padding: 9px 14px;
    transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

a.back:hover {
    background-color: #e8f4ff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

a.back:active {
    transform: translateY(1px);
}

footer.gotop {
    display: inline-block;
    color: #ffffff;
    padding: 10px 15px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.gotop {
    display: none;
    position: fixed;
    bottom: 2rem;
    right: 1rem;
}

.gotop a{
    padding: 0;
    margin: 0;
    border: 0;
    text-decoration: none;
    background-image: url('../assets/ui/gotop.svg');
    color: white;
    background-color:#34495e;
    width: 2em;
    height: 2em;
    border-radius: 50%;
    opacity: 1.0;
    animation: buttonflow 3s 1;
    display: block;
}

.gotop a:hover {
    opacity: 0.60;
    color: grey;
}