/* ==========================================================================
   导航栏样式
   ========================================================================== */
   .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: transform var(--transition-normal) ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar.nav-hidden {
    transform: translateY(-100%);
}

/* 导航容器 */
.nav-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.nav-logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
    width: auto;
}

/* 导航链接容器 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

/* 导航项 */
.nav-item {
    position: relative;
}

/* 导航链接 */
.nav-link {
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* 下拉菜单 */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-dropdown-toggle::after {
    content: '';
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.3s ease;
}

.nav-dropdown.active .nav-dropdown-toggle::after {
    transform: rotate(-135deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 8px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
}

.nav-dropdown-menu a {
    display: block;
    padding: 10px 15px;
    color: var(--color-text-primary);
    font-weight: 500;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-dropdown-menu a:hover {
    background-color: var(--color-background);
    color: var(--color-primary);
}

/* 语言切换 */
.nav-language {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: 20px;
    padding-left: 20px;
    border-left: 1px solid var(--color-border);
}

.language-btn {
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    padding: 10px;
    font-size: 24px;
}

/* 移动端样式 */
@media (max-width: 768px) {
    .navbar {
        height: 70px;
    }

    .logo-img {
        height: 36px;
    }

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

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        height: calc(100vh - 70px);
        flex-direction: column;
        background: white;
        gap: 10px;
        padding: 20px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        overflow-y: auto;
        z-index: 998;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        display: block;
        text-align: center;
        padding: 15px;
    }

    .nav-dropdown {
        width: 100%;
    }

    .nav-dropdown-toggle {
        width: 100%;
        justify-content: center;
        padding: 15px;
    }

    .nav-dropdown-menu {
        position: static;
        width: 100%;
        transform: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        display: none;
        margin: 10px 0;
    }

    .nav-dropdown.active .nav-dropdown-menu {
        display: block;
    }

    .nav-dropdown-menu a {
        text-align: center;
    }

    .nav-language {
        margin: 20px 0 0;
        padding: 20px 0 0;
        border-left: none;
        border-top: 1px solid var(--color-border);
        width: 100%;
        justify-content: center;
    }
}

/* 暗色背景遮罩 */
.nav-backdrop {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 997;
}

.nav-backdrop.active {
    display: block;
}

/* iPhone 安全区域 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    @media (max-width: 768px) {
        .nav-links {
            padding-bottom: calc(20px + env(safe-area-inset-bottom));
        }
    }
}