/* 导入CSS变量 */
@import './variables.css';

/* 导航栏 - 移动优先设计 */
header {
    background-color: transparent;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

/* 导航容器 */
.nav-container {
    display: flex;
    align-items: center;
    margin-left: auto;
    margin-right: var(--spacing-md);
}

/* 桌面端导航容器 */
@media (min-width: 768px) {
    .nav-container {
        display: flex;
        align-items: center;
        margin-left: auto;
        margin-right: 0;
    }
    
    .nav-links {
        margin-right: var(--spacing-xl);
    }
}

/* 移动端导航容器 */
@media (max-width: 767px) {
    .nav-container {
        display: none;
    }
    
    /* 确保移动端导航菜单可见 */
    .nav-links {
        display: flex;
    }
}

.logo-img {
    max-width: 45px;
    height: 32px;
    object-fit: contain;
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-md);
}

/* 移动端logo */
@media (max-width: var(--breakpoint-sm)) {
    .logo-img {
        max-width: 40px;
        height: 28px;
    }

    header.scrolled .logo-img {
        max-width: 35px;
        height: 24px;
    }
}

/* 主题切换按钮容器 */
.theme-toggle-container {
    display: flex;
    align-items: center;
    margin-left: auto;
    z-index: 1001;
}

/* 主题切换开关样式 */
.theme-toggle {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    cursor: pointer;
}

.theme-toggle-checkbox {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-light);
    border-radius: 24px;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    overflow: hidden;
}

/* 主题图标 */
.theme-icon {
    position: absolute;
    transition: all var(--transition-normal);
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-icon img {
    width: 12px;
    height: 12px;
    transition: all var(--transition-normal);
}

.sun-icon {
    left: 6px;
    transform: translateX(0);
}

.moon-icon {
    right: 6px;
    transform: translateX(0);
}

/* 滑块 */
.theme-toggle-slider:after {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-light);
    border-radius: 50%;
    transition: var(--transition-normal);
    z-index: 2;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* 选中状态 */
.theme-toggle-checkbox:checked + .theme-toggle-slider {
    background-color: var(--primary-color);
}

.theme-toggle-checkbox:checked + .theme-toggle-slider:after {
    transform: translateX(26px);
}

/* 图标动画 */
.theme-toggle-checkbox:checked + .theme-toggle-slider .sun-icon {
    transform: translateX(-100%);
    opacity: 0;
}

.theme-toggle-checkbox:checked + .theme-toggle-slider .moon-icon {
    transform: translateX(-26px);
    opacity: 1;
}

.theme-toggle-checkbox:not(:checked) + .theme-toggle-slider .sun-icon {
    transform: translateX(0);
    opacity: 1;
}

.theme-toggle-checkbox:not(:checked) + .theme-toggle-slider .moon-icon {
    transform: translateX(100%);
    opacity: 0;
}



/* 移动端主题切换按钮 */
.mobile-theme-toggle {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
    width: 100%;
    display: flex;
    justify-content: center;
}

/* 响应式设计 */
@media (max-width: 767px) {
    /* 移动端隐藏顶部主题切换按钮 */
    .theme-toggle-container {
        display: none;
    }
    
    /* 移动端显示汉堡菜单中的主题切换按钮 */
    .mobile-theme-toggle {
        display: flex;
    }
}

@media (min-width: 768px) {
    /* 桌面端隐藏汉堡菜单中的主题切换按钮 */
    .mobile-theme-toggle {
        display: none;
    }
    
    /* 桌面端显示顶部主题切换按钮 */
    .theme-toggle-container {
        display: flex;
    }
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.menu-toggle img {
    width: 24px;
    height: 24px;
    fill: var(--text-light);
    transition: all var(--transition-normal);
}

header.scrolled .menu-toggle img {
    fill: var(--text-primary);
}

/* 移动端导航菜单 - 默认隐藏 */
.nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-secondary);
    box-shadow: var(--shadow-xl);
    list-style: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right var(--transition-normal);
    z-index: 1000;
    gap: var(--spacing-xl);
}

.nav-links.active {
    right: 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 500;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
}

.nav-links a:hover {
    background: var(--primary-light);
    color: var(--text-light);
}

/* 滚动时的导航栏样式 */
header.scrolled {
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-md);
}

header.scrolled .logo-img {
    max-width: 40px;
    height: 28px;
}

/* 桌面端导航样式 */
@media (min-width: 768px) {
    nav {
        padding: var(--spacing-lg) 0;
    }
    
    .logo-img {
        max-width: 55px;
        height: 40px;
    }
    
    header.scrolled .logo-img {
        max-width: 45px;
        height: 32px;
    }
    
    /* 隐藏汉堡菜单和移动端导航 */
    .menu-toggle {
        display: none;
    }
    
    .nav-links {
        display: none;
    }
    
    /* 显示桌面端导航菜单 */
    .desktop-nav-links {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        box-shadow: none;
        flex-direction: row;
        gap: var(--spacing-xl);
        display: flex;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    
    .desktop-nav-links li {
        margin: 0;
    }
    
    .desktop-nav-links a {
        color: var(--text-light);
        font-weight: 500;
        padding: var(--spacing-sm) 0;
        position: relative;
        font-size: var(--font-size-md);
        background: transparent;
        border-radius: 0;
        text-decoration: none;
        transition: all var(--transition-normal);
    }
    
    .desktop-nav-links a:hover {
        background: transparent;
        color: var(--text-light);
    }
    
    header.scrolled .desktop-nav-links a {
        color: var(--text-primary);
    }
    
    header.scrolled .desktop-nav-links a:hover {
        color: var(--primary-color);
    }
    
    /* 导航链接下划线效果 */
    .desktop-nav-links a:after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background-color: var(--primary-color);
        transition: width var(--transition-normal);
    }
    
    .desktop-nav-links a:hover:after {
        width: 100%;
    }
}