:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --primary-color: #000000;
}
[data-theme="dark"] {
    --bg-color: #212429;
    --text-color: #d1d5db;
    --primary-color: #8e949e;
}
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    font-family: Arial, sans-serif;
    padding-top: 80px;
}
header, footer {
    position: fixed;
    width: 100%;
    background-color: var(--bg-color);
    padding: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    z-index: 999;
}
footer { bottom: 0; justify-content: center;}
nav a {
    color: var(--text-color);
    text-decoration: none;
    margin: 10px 10px;
}
.logo { width: 40px; height: 40px; }

button {
    background-color: var(--primary-color);
    color: var(--bg-color);
    border: none;
    cursor: pointer;
    border-radius: 10px;
    display: fixed;
}
section {
    padding: 40px 20px;
    text-align: center;
}
img { width: 150px; margin: 5px; }

header {
	top: 0; 
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background-color: var(--bg-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: right;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: flex-end;
    flex-grow: 1;
    margin-right: 20px;
}

nav a {
    margin-left: 20px;
}

.logo {
    height: 40px;
    cursor: pointer;
}