body {
    font-family: 'Courier New', Courier, monospace;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}
header {
    width: 100%;
    background-color: #007BFF;
    color: white;
    padding: 10px 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    z-index: 1000;
    box-sizing: border-box;
}
header img {
    height: 55px;
}
header h1 {
    margin: 0;
    font-size: 24px;
    flex-grow: 1;
    text-align: center;
}
.burger-menu {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    z-index: 1100;
}
.burger-menu .bar {
    width: 25px;
    height: 3px;
    background-color: white;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.burger-menu.open .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.burger-menu.open .bar:nth-child(2) {
    opacity: 0;
}
.burger-menu.open .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}
nav {
    display: flex;
    flex-direction: column;
    width: 220px;
    background-color: #0056b3;
    position: absolute;
    top: 75px;
    right: 20px;
    box-sizing: border-box;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}
nav.show {
    max-height: 500px;
}
nav a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    padding: 10px;
    text-align: left;
}
nav .submenu-container {
    display: flex;
    flex-direction: column;
}
nav .submenu {
    display: flex;
    flex-direction: column;
    background-color: #003d80;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}
nav .submenu a {
    padding-left: 20px;
}
nav .has-submenu.open + .submenu {
    max-height: 200px;
}
#sidebar {
    width: 210px;
    background-color: #f4f4f4;
    padding: 20px;
    position: fixed;
    top: 60px;
    bottom: 0;
    overflow-y: auto;
    box-sizing: border-box;
}
#content {
    margin-left: 220px;
    padding: 80px 20px 20px;
    flex-grow: 1;
    box-sizing: border-box;
}
#sidebar a {
    display: block;
    color: #007BFF;
    text-decoration: none;
    margin: 10px 0;
}
#sidebar a:hover {
    text-decoration: underline;
}
h2, h3 {
    margin-top: 50px;
}

.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f4f4f4;
}
.login-container form {
    background-color: white;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.login-container input {
    margin-bottom: 10px;
    padding: 10px;
    width: 100%;
    box-sizing: border-box;
}
.login-container button {
    padding: 10px;
    width: 100%;
    background-color: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
}
.login-container button:hover {
    background-color: #0056b3;
}

.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f4f4f4;
}
.error-container h1 {
    color: #d9534f;
}
.error-container p {
    margin: 10px 0;
}
footer {
    margin-top: auto;
    padding: 10px 0;
    text-align: center;
    width: 100%;
    background: #B1C9EF;
    color: #F0F3FA;
    position: fixed;
    bottom: 0;
}

.highlight-bugfix {
    background-color: #00ff51;
    font-weight: bold;
}

.highlight-update {
    background-color: #00ffff;
    font-weight: bold;
}

.highlight-feature {
    background-color: #f70000;
    font-weight: bold;
}

.highlight-implementation {
    background-color: #f5ff00;
    font-weight: bold;
}

@media (max-width: 768px) {
    header {
        width: 100vw;
        box-sizing: border-box;
    }
    #sidebar {
        width: 100%;
        position: relative;
        top: 0;
        margin-top: 60px;
    }
    #content {
        margin: 0;
        padding: 20px;
    }
    header h1 {
        font-size: 20px;
        text-align: center;
        flex-grow: 1;
    }
    nav {
        right: 0;
        width: 100%;
    }
}