/* 顶部区域：页头 */
.site-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-image {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.logo h1 a {
    color: #333;
    font-size: 1.8rem;
    font-weight: bold;
}

.main-navigation ul {
    display: flex;
    list-style: none;
    flex-direction: row-reverse;
}

.main-navigation li {
    margin-left: 1.5rem;
}

.main-navigation a {
    color: #333;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.main-navigation a:hover,
.main-navigation a.active {
    background-color: #007bff;
    color: white;
}

/* 移动端导航菜单按钮 */
.nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 101;
    background: #007bff;
    color: white;
    border-radius: 4px;
    transition: all 0.3s ease;
    border: none;
}

.nav-toggle:hover {
    background: #0056b3;
    transform: scale(1.1);
}

/* 移动端导航菜单 */
.main-navigation {
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .site-header .container {
        position: relative;
    }
    
    .logo {
        z-index: 102;
    }
    
    .nav-toggle {
        display: block;
        z-index: 102;
    }

    .main-navigation {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 4px 8px rgba(0,0,0,.1);
        padding: 1rem 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
    }
    
    .main-navigation.mobile-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .main-navigation ul {
        flex-direction: column;
        align-items: center;
    }

    .main-navigation li {
        margin: 0.5rem 0;
    }

    .main-navigation a {
        display: block;
        text-align: center;
        padding: 0.75rem;
    }
}