/* General Body Styles */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* Header Styles */
header {
    background: #ffffff;
    color: white;
    padding: 20px 40px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border-bottom: 3px solid #0056b3;
}

header h1 {
    margin: 0;
    font-size: 2.8em;
    font-weight: bold;
    color: #003366; /* Deep Navy Blue for trust and authority */
}

header nav {
    margin-top: 15px;
}

header nav a {
    color: #555;
    margin: 0 18px;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: 500;
    transition: color 0.3s;
}

header nav a:hover {
    color: #0056b3;
}

/* Main Content Styles */
main {
    width: 85%;
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    background: transparent; /* Let the body background show through */
}

/* Guestbook-specific styles */
guest-book {
    display: block;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

/* Announcement-specific styles */
#app h2 {
    font-size: 2em;
    color: #003366;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}