body {
    font-family: Arial, sans-serif;
    background-color: #2c3e50;
    color: #ecf0f1;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    min-height: 100vh;
    transition: background 0.5s;
}

nav {
    width: 100%;
    background-color: #34495e;
    padding: 10px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-links {
    list-style-type: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin: 0 15px;
}

.nav-links li a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-links li a:hover {
    background-color: #e74c3c;
}

#darkModeToggle {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: #e74c3c;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s;
}

#darkModeToggle:hover {
    background-color: #c0392b;
}

.container {
    background-color: #34495e;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    text-align: center;
    margin-top: 50px;
}

h1 {
    margin-bottom: 20px;
}

form {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 10px;
}

input[type="date"] {
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-bottom: 20px;
    width: calc(100% - 22px);
    max-width: 300px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: #e74c3c;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #c0392b;
}

#result {
    font-size: 1.2em;
}

.dark-mode {
    background-color: #1a252f;
    color: #bdc3c7;
}

.dark-mode nav {
    background-color: #1a252f;
}

.dark-mode .container {
    background-color: #1a252f;
}

.dark-mode .nav-links li a:hover {
    background-color: #e74c3c;
}

/* Emoji background patterns */
body.emoji-0 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">👶</text></svg>');
}

body.emoji-1 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">🧒</text></svg>');
}

body.emoji-2 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">🧑</text></svg>');
}

body.emoji-3 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">🧔</text></svg>');
}

body.emoji-4 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">👨‍🦳</text></svg>');
}

body.emoji-5 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">👴</text></svg>');
}

body.emoji-6 {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text y="50%" x="50%" dy=".35em" text-anchor="middle" font-size="200">🧓</text></svg>');
}

body.emoji-0, body.emoji-1, body.emoji-2, body.emoji-3, body.emoji-4, body.emoji-5, body.emoji-6 {
    background-size: 200px 200px;
    background-repeat: repeat;
    background-attachment: fixed;
    animation: move 10s linear infinite;
}

@keyframes move {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 100% 100%;
    }
}