.language-nav {
    position: fixed;
    top: 20px;
    right: 30px;
    display: flex;
    gap: 25px;
    z-index: 1000;
}

.lang-switcher {
    position: relative;
    background: none;
    border: 0;
    font-size: 16px;
    cursor: pointer;
    color: #666;
    padding: 8px 12px;
    transition: color 0.3s ease, background-color 0.3s ease;
}

.lang-switcher.active {
    color: var(--primary-color);
    font-weight: 500;
    border-bottom: 2px solid var(--accent-color);
    background-color: rgba(52, 152, 219, 0.1); /* 浅色背景突出显示 */
}

.lang-switcher:not(.active):hover {
    color: var(--accent-color);
}

section {
    margin-bottom: 2rem;
}