/**
 * 导航栏组件样式 - NavbarComponent.css
 * 从 styles.css / index.html 中提取的完整导航栏样式
 */

/* ==================== 导航栏基础样式 ==================== */

/* 强制同步 .navbar 的高度与 line-height（由 styles.css 的 :root --nav-height 控制） */
.navbar {
    height: var(--nav-height, 65px);
    line-height: var(--nav-height, 65px);
}

/* 导航栏主样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md, 16px) var(--spacing-lg, 24px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-light, #F4F4F4);
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ==================== 导航栏过渡效果 ==================== */
.navbar,
.navbar a,
.navbar .logo,
.navbar .hamburger span,
.navbar .lang-toggle {
    transition: background-color 0.5s, color 0.5s, border-color 0.5s, box-shadow 0.5s, transform 0.5s, opacity 0.5s, padding 0.5s;
}

/* ==================== 导航栏左侧区域 ==================== */
.nav-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl, 48px);
}

/* Logo 样式 */
.logo {
    font-size: var(--font-size-lg, 1.25rem);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo a {
    color: var(--color-text-dark, #111111);
    text-decoration: none;
}

/* ==================== 导航菜单 ==================== */
.nav-menu {
    display: flex;
    gap: 40px;
    list-style: none;
    margin: 0;
    padding: 0;
}

/* 关闭按钮 */
.nav-close-btn {
    background: rgba(0, 0, 0, 0.05);
    color: #111111;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-family: inherit;
}

.nav-menu a {
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    color: var(--color-text-dark, #111111);
    text-decoration: none;
    transition: color 0.2s ease-out;
}

/* 导航链接 hover */
.nav-menu a:hover {
    color: var(--color-accent, #111111);
    text-decoration: none;
}

/* 当前页面高亮 */
.nav-menu a.active {
    color: var(--color-accent, #111111);
}

/* 链接下划线动画 */
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary, #111111);
    transition: width 0.2s ease-out;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* ==================== 语言切换按钮 ==================== */
.lang-toggle {
    background: none;
    border: 1px solid var(--color-primary, #111111);
    color: var(--color-text-dark, #111111);
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    padding: 0 16px;
    height: 32px;
    line-height: 1;
    border-radius: 12px;
    transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.lang-toggle:hover {
    background: var(--color-primary, #111111);
    color: var(--color-secondary, #F7F7F7);
}

/* ==================== 汉堡按钮 ==================== */
/* 桌面端默认隐藏 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 34px;
    height: 34px;
    padding: 0;
    background: none;
    border: 1px solid var(--color-primary, #111111);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0;
    transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
    margin-left: 0;
}

.hamburger span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--color-primary, #111111);
    border-radius: 1px;
    transition: transform 0.3s, opacity 0.3s;
    margin: 0 auto;
}

.hamburger:hover {
    background: #f0f0f0;
}

/* 汉堡按钮激活状态（X 动画） */
.hamburger.active span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

/* ==================== 暗色磨砂玻璃模式（glass-mode） ==================== */
.navbar.glass-mode {
    background: rgba(17, 17, 17, 0.25) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
    box-shadow: none !important;
}

.navbar.glass-mode .logo,
.navbar.glass-mode .logo a,
.navbar.glass-mode .nav-menu a {
    color: #FFFFFF !important;
}

.navbar.glass-mode .nav-menu a::after {
    background-color: #FFFFFF !important;
}

.navbar.glass-mode .hamburger span {
    background: #FFFFFF !important;
}

.navbar.glass-mode .lang-toggle {
    color: #FFFFFF !important;
    border-color: rgba(255, 255, 255, 0.3) !important;
    border-radius: 12px !important;
}

.navbar.glass-mode .lang-toggle:hover {
    background: rgba(255, 255, 255, 0.15) !important;
    color: #FFFFFF !important;
}

/* glass-mode 下的关闭按钮 */
.navbar.glass-mode .nav-close-btn {
    background: rgba(255, 255, 255, 0.1) !important;
    color: #FFFFFF !important;
}

.navbar.glass-mode .nav-close-btn:hover {
    background: rgba(255, 255, 255, 0.2) !important;
}

/* ==================== 响应式：平板端（768px - 1023px） ==================== */
@media (min-width: 768px) and (max-width: 1023px) {
    /* 语言切换按钮与汉堡按钮间距 44px */
    .lang-toggle {
        margin-right: 22px;
    }

    /* 汉堡按钮显示 */
    .hamburger {
        display: flex;
        border: none;
    }

    .navbar:has(.nav-menu.open) .lang-toggle {
        display: none;
    }

    .navbar {
        flex-wrap: wrap;
        gap: 0;
        padding: 0 var(--spacing-lg, 24px);
        align-items: center;
    }

    .navbar:has(.nav-menu.open) .logo {
        display: none;
    }

    .navbar:has(.nav-menu.open) .nav-left {
        flex: 1 1 auto;
        min-width: 0;
    }

    .navbar:has(.nav-menu.open) {
        border-bottom-color: transparent;
    }

    .navbar:has(.nav-menu.open) .nav-right {
        position: fixed;
        top: 10px;
        right: var(--spacing-lg, 24px);
        z-index: 1000001;
    }

    .nav-left {
        flex: 1;
        width: auto;
    }

    /* 菜单默认折叠 */
    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0;
        padding: var(--spacing-sm, 8px) 0;
        border-top: 1px solid var(--color-gray-light, #F4F4F4);
        margin-top: var(--spacing-sm, 8px);
    }

    /* 菜单展开：全屏 fixed overlay（毛玻璃效果） */
    .nav-menu.open {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        position: fixed;
        inset: 0;
        width: 100%;
        max-width: none;
        height: 100vh;
        height: 100dvh;
        margin: 0;
        padding: 72px var(--spacing-lg, 24px) 48px;
        box-sizing: border-box;
        gap: 100px;
        background: rgba(255, 255, 255, 0.75) !important;
        backdrop-filter: blur(20px) saturate(180%) !important;
        -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
        z-index: 1000000;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        border: none;
    }

    .nav-menu.open li {
        width: 100%;
        text-align: center;
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        box-sizing: border-box;
    }

    .nav-menu li a {
        display: block;
        padding: 10px 0;
        font-size: var(--font-size-sm, 0.875rem);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .nav-menu.open li a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        font-size: 16px;
        padding: 0;
        line-height: 1.25;
        border-bottom: none;
    }

    .nav-menu.open li a::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .nav-menu.open li a:hover::after {
        width: 100%;
    }

    /* 全屏导航关闭按钮 - 仅在菜单展开时显示 */
    .nav-close-btn {
        position: absolute;
        top: var(--spacing-4, 16px);
        right: var(--spacing-5, 24px);
        width: 40px;
        height: 40px;
        background: rgba(0, 0, 0, 0.05);
        color: #111111;
        border: none;
        border-radius: 50%;
        cursor: pointer;
        display: none;
        align-items: center;
        justify-content: center;
        font-size: 24px;
        transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
        z-index: 1000001;
        font-family: inherit;
    }

    .navbar:has(.nav-menu.open) .nav-close-btn {
        display: flex;
    }

    .nav-close-btn:hover {
        background: rgba(0, 0, 0, 0.1);
        transform: rotate(90deg);
    }
}

/* ==================== 响应式：移动端（≤ 767px） ==================== */
@media (max-width: 767px) {
    /* 语言切换按钮与汉堡按钮间距 44px */
    .lang-toggle {
        margin-right: 22px;
    }

    body.nav-open-mobile {
        overflow: hidden;
    }

    /* 汉堡按钮显示 */
    .hamburger {
        display: flex;
        border: none;
    }

    .navbar:has(.nav-menu.open) .lang-toggle {
        display: none;
    }

    .navbar {
        flex-wrap: wrap;
        gap: 0;
        padding: 0 var(--spacing-md, 16px);
        align-items: center;
    }

    .navbar:has(.nav-menu.open) .logo {
        display: none;
    }

    .navbar:has(.nav-menu.open) .nav-left {
        flex: 1 1 auto;
        min-width: 0;
    }

    .navbar:has(.nav-menu.open) {
        border-bottom-color: transparent;
    }

    .navbar:has(.nav-menu.open) .nav-right {
        position: fixed;
        top: 10px;
        right: var(--spacing-md, 16px);
        z-index: 1000001;
    }

    .nav-left {
        flex: 1;
        width: auto;
    }

    /* 菜单默认折叠 */
    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0;
        padding: var(--spacing-sm, 8px) 0;
        border-top: 1px solid var(--color-gray-light, #F4F4F4);
        margin-top: var(--spacing-sm, 8px);
    }

    /* 菜单展开：全屏 fixed overlay（毛玻璃效果） */
    .nav-menu.open {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        position: fixed;
        inset: 0;
        width: 100%;
        max-width: none;
        height: 100vh;
        height: 100dvh;
        margin: 0;
        padding: 72px var(--spacing-md, 16px) 48px;
        box-sizing: border-box;
        gap: 100px;
        background: rgba(255, 255, 255, 0.75) !important;
        backdrop-filter: blur(20px) saturate(180%) !important;
        -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
        z-index: 1000000;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        border: none;
    }

    .nav-menu.open li {
        width: 100%;
        text-align: center;
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        box-sizing: border-box;
    }

    .nav-menu li a {
        display: block;
        padding: 10px 0;
        font-size: var(--font-size-sm, 0.875rem);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .nav-menu.open li a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        font-size: 16px;
        padding: 0;
        line-height: 1.25;
        border-bottom: none;
    }

    .nav-menu.open li a::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .nav-menu.open li a:hover::after {
        width: 100%;
    }

    /* 全屏导航关闭按钮 - 仅在菜单展开时显示 */
    .nav-close-btn {
        position: absolute;
        top: var(--spacing-4, 16px);
        right: var(--spacing-5, 24px);
        width: 40px;
        height: 40px;
        background: rgba(0, 0, 0, 0.05);
        color: #111111;
        border: none;
        border-radius: 50%;
        cursor: pointer;
        display: none;
        align-items: center;
        justify-content: center;
        font-size: 24px;
        transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
        z-index: 1000001;
        font-family: inherit;
    }

    .navbar:has(.nav-menu.open) .nav-close-btn {
        display: flex;
    }

    .nav-close-btn:hover {
        background: rgba(0, 0, 0, 0.1);
        transform: rotate(90deg);
    }
}

/* ==================== 响应式：超小屏（≤ 480px） ==================== */
@media (max-width: 480px) {
    .navbar {
        padding: 0 16px;
    }

    .nav-menu.open li a {
        font-size: 16px;
    }

    .lang-toggle {
        padding: 0 12px;
        font-size: 12px;
    }
}

/* ==================== Frosted Glass Fix (Light Mode) ==================== */
body.nav-open-mobile .navbar {
    background: transparent !important;
    border-color: transparent !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

body.nav-open-mobile .navbar .nav-menu.open {
    background: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(50px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(50px) saturate(180%) !important;
}