/* Dortmund Netzwerk - Custom Style */
:root {
    --do-yellow: #fde100;
    --do-black: #1a1a1a;
    --do-gray: #2e2e2e;
    --do-white: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--do-black);
    color: var(--do-white);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background-color: var(--do-yellow);
    color: var(--do-black);
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

nav {
    display: flex;
    justify-content: center;
    background: var(--do-gray);
    padding: 10px;
}

nav a {
    color: var(--do-white);
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--do-yellow);
}

.container {
    max-width: 1100px;
    margin: 20px auto;
    padding: 20px;
    background: var(--do-gray);
    border-radius: 8px;
}

footer {
    text-align: center;
    padding: 20px;
    background: var(--do-black);
    border-top: 3px solid var(--do-yellow);
    margin-top: 50px;
}

.btn-download {
    display: inline-block;
    background: var(--do-yellow);
    color: var(--do-black);
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
}