html {
    height: 100%;
}

body {
    margin: 0;
    padding: 20px;
    font-family: 'Tahoma', 'MS Sans Serif', sans-serif;
    
    background: #008080 url('tile2.png') repeat;
    background-size: 33px 33px;
    background-attachment: fixed;
    background-position: top left;
    
    color: #00ff41;
    line-height: 1.5;
    min-height: 100vh;
}


.container {
    max-width: 1100px;
    margin: 0 auto;
    background: #c0c0c0;
    border: 4px solid #dfdfdf;
    border-bottom-color: #808080;
    border-right-color: #808080;
    padding: 8px;
    box-shadow: 4px 4px 0 #00000080;
}


header {
    text-align: center;
    margin-bottom: 15px;
}

.main-logo {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border: 3px solid #dfdfdf;
    border-bottom-color: #808080;
    border-right-color: #808080;
    box-shadow: 3px 3px 0 #00000080;
}


.main-wrapper {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: stretch;
}


.nav-panel {
    width: 190px;
    background: #c0c0c0;
    border: 3px solid #ffffff;
    border-bottom-color: #808080;
    border-right-color: #808080;
    padding: 4px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.nav-inner {
    background: #c0c0c0;
    border: 2px solid #808080;
    border-bottom-color: #ffffff;
    border-right-color: #ffffff;
    padding: 10px 6px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.nav-title {
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
    border-bottom: 2px solid #808080;
    padding-bottom: 6px;
    color: #000000;
}

nav {
    flex: 1;
}

nav a {
    display: block;
    color: #0000ff;
    text-decoration: none;
    padding: 4px 8px;
    margin: 2px 0;
}

nav a:hover {
    background: #000080;
    color: #ff00ff;
}


.content-panel {
    flex: 1;
    min-width: 300px;
    background: #c0c0c0;
    border: 4px solid #dfdfdf;
    border-bottom-color: #808080;
    border-right-color: #808080;
    padding: 6px;
}

.content-inner {
    background: #000000;
    border: 3px solid #808080;
    border-bottom-color: #ffffff;
    border-right-color: #ffffff;
    padding: 25px 30px;
    color: #00ff41;
    
    max-height: 620px;
    overflow-y: scroll;
    overflow-x: hidden;
}


.content-inner::-webkit-scrollbar {
    width: 18px;
}

.content-inner::-webkit-scrollbar-track {
    background: #c0c0c0;
    border: 2px solid #808080;
    border-bottom-color: #ffffff;
    border-right-color: #ffffff;
}

.content-inner::-webkit-scrollbar-thumb {
    background: #c0c0c0;
    border: 2px solid #ffffff;
    border-bottom-color: #808080;
    border-right-color: #808080;
}

.content-inner::-webkit-scrollbar-thumb:hover {
    background: #dfdfdf;
}


.content-inner h1 {
    color: #00ff00;
    margin-top: 0;
    text-decoration: underline;
}


@media (max-width: 800px) {
    .main-wrapper {
        flex-direction: column;
    }
    .nav-panel {
        width: 100%;
    }
    .content-inner {
        max-height: 55vh;
    }
}