body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff39;  /* unify page background to white */
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background-color: #333;  /* match nav bar color */
    color: white;
    text-align: center;
    padding: 1.5em 1em 2.5em;  /* extra bottom padding as dark spacer */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.header-title {
    margin: 0;
    font-size: 2.5em;
}

.header-subtitle {
    margin: 0;
    font-size: 1.2em;
    font-weight: normal;
    opacity: 0.8;
}

.header-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.logo {
    display: block;
    margin: 0 auto;
    max-width: 150px;
}

nav {
    padding: 0.5em 0;  /* add vertical padding to nav */
    background-color: #333;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 10px;
}

nav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

nav ul li a:hover {
    background-color: #111;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.5);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1em;
}

.content-window {
    /* fill available space and center inner content */
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
    overflow: hidden;
}

.markdown-content {
    line-height: 1.5;   /* increase line spacing */
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    height: 100%;
    overflow-y: auto;
    padding: 20px;
}

/* Banner image styling */
.banner-container {
    text-align: center;
    margin-bottom: 1em;
}
.banner-img {
    max-width: 100%;
    height: auto;
    max-height: 200px;  /* adjust as needed */
    display: inline-block;
}

footer {
    text-align: center;
    padding: 1em;
    background-color: #f1f1f1;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
}

footer button {
    margin: 5px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

footer button:hover {
    background-color: #45a049;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Layout wrapper classes */
.outer {
    display: flex;
    justify-content: center;
}
.inner {
    max-width: 800px;
    width: 100%;
}