/* 导航栏 */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 0.8rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo span {
    color: var(--secondary);
}

.logo img {
    width: auto;
    height: 3rem;
    margin-right: 1rem;
}

.nav-links {
    display: flex;
    list-style: none;
    transition: var(--transition);
}

.nav-links li {
    margin-left: 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--secondary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--secondary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.language-switcher {
    margin-left: 2rem;
}

.language-switcher select {
    border: 1px solid #ddd;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    background-color: var(--white);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary);
}

/* 手机端导航优化 */
@media (max-width: 1200px) {
    .section {
        padding: 2rem;
    }

    .nav-links, .language-switcher {
        display: none;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        padding: 1rem 0;
        z-index: 1001;
    }

    .nav-links.mobile-open li {
        margin: 0;
        width: 100%;
    }

    .nav-links.mobile-open a {
        display: block;
        padding: 0.8rem 2rem;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-links.mobile-open a:last-child {
        border-bottom: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .language-switcher.mobile-open {
        display: block;
        padding: 0.8rem 2rem;
        border-top: 1px solid #f0f0f0;
    }

    .language-switcher.mobile-open select {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-links, .language-switcher {
        display: none;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        padding: 1rem 0;
        z-index: 1001;
    }

    .nav-links.mobile-open li {
        margin: 0;
        width: 100%;
    }

    .nav-links.mobile-open a {
        display: block;
        padding: 0.8rem 2rem;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-links.mobile-open a:last-child {
        border-bottom: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .language-switcher.mobile-open {
        display: block;
        padding: 0.8rem 2rem;
        border-top: 1px solid #f0f0f0;
    }

    .language-switcher.mobile-open select {
        width: 100%;
    }
}