body {
    font-family: Arial, sans-serif;
    background: #fff;
    color: #000;
    margin: 0;
}
header {
    background: orange;
    color: #000;
    padding: 1rem;
}
header a {
    color: #000;
    margin-right: 1rem;
    text-decoration: none;
}
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 1rem;
    background: #fff;
}
header .container {
    background: orange;
    color: #000;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    position: relative;
    padding-right: 5rem;
}
.main-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    padding-right: 5rem;
}
.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin: 0;
    margin-left: auto;
    position: absolute;
    top: 1rem;
    right: 1rem;
}
.language-switcher button {
    background: none;
    border: none;
    padding: 0;
    color: #000;
    cursor: pointer;
    font-weight: 600;
    text-transform: lowercase;
}
.language-switcher button.active {
    text-decoration: underline;
}
.messages li {
    list-style: none;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}
.messages .success {
    background: #d1fae5;
}
.messages .error {
    background: #fee2e2;
}
.button {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #2563eb;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
}
.locked {
    color: #b91c1c;
    font-weight: bold;
}
.quiz-question {
    margin-bottom: 1rem;
}