/* 导航栏样式 */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1152px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    flex-shrink: 0;
}

.nav-logo img {
    height: 36px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: 32px;
    margin-left: 48px;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 6px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1.6px;
    background: var(--gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-menu a:hover::after {
    transform: scaleX(1);
}

.nav-link-external {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.nav-link-external i {
    font-size: 0.5em;
    color: #999;
}

.nav-actions {
    display: flex;
    gap: 13px;
    align-items: center;
}

.language-switcher {
    display: inline-block;
}

.btn-language {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 6px 13px;
    cursor: pointer;
    transition: color 0.2s;
    text-decoration: none;
}

.btn-language:hover {
    color: var(--text-primary);
    background: transparent;
}

.btn-language:active {
    color: var(--primary);
    background: transparent;
}

.btn-language:focus {
    outline: none;
    background: transparent;
}

.btn-text {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 6px 13px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.btn-text:hover {
    color: var(--primary);
    background: var(--primary-light);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: 1001;
}

.mobile-menu-btn span {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
    display: block;
    border-radius: 2px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .nav-container {
        height: 56px;
        padding: 0 16px;
    }

    .nav-menu {
        gap: 16px;
        margin-left: 24px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        height: 56px;
    }
    
    .nav-container {
        padding: 0 16px;
        height: 56px;
    }
    
    .main-nav .nav-menu {
        display: none !important;
        position: fixed !important;
        top: 56px !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        background: rgba(255, 255, 255, 0.98) !important;
        backdrop-filter: blur(12px);
        padding: 20px 16px !important;
        /* box-shadow: 0 4px 12px rgba(0,0,0,0.1); */
        flex-direction: column !important;
        gap: 12px;
        z-index: 999 !important;
        max-height: calc(100vh - 56px);
        overflow-y: auto;
        margin: 0 !important;
        visibility: hidden !important;
        opacity: 0 !important;
        transition: opacity 0.3s ease, visibility 0.3s ease;
        min-height: auto !important;
    }
    
    .main-nav .nav-menu.active {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        height: auto !important;
        min-height: auto !important;
    }
    
    /* 确保菜单内容可见 */
    .main-nav .nav-menu.active a {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    .main-nav .nav-menu a {
        padding: 12px 0;
        font-size: 16px;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        display: block;
        width: 100%;
    }
    
    .main-nav .nav-menu a:last-child {
        border-bottom: none;
    }

    .main-nav .nav-actions {
        display: none !important;
        position: fixed !important;
        left: 0 !important;
        right: 0 !important;
        background: rgba(255, 255, 255, 0.98) !important;
        backdrop-filter: blur(12px);
        padding: 16px !important;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        z-index: 998 !important;
        flex-direction: column !important;
        gap: 12px;
        border-top: 1px solid rgba(0, 0, 0, 0.05);
        margin: 0 !important;
    }
    
    .main-nav .nav-actions.active {
        display: flex !important;
    }

    .mobile-menu-btn {
        display: flex !important;
        z-index: 1001;
        position: relative;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .btn-language {
        width: 100%;
        text-align: center;
        padding: 12px;
        font-size: 16px;
    }
    
    .btn-text,
    .btn-primary {
        width: 100%;
        text-align: center;
        padding: 12px;
        font-size: 16px;
        display: block;
    }
}