/* Multi-language Support Styles */

/* Language-specific font configurations */
html[data-lang="en"] body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    letter-spacing: -0.01em;
    line-height: 1.6;
}

html[data-lang="zh"] body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    letter-spacing: 0.02em;
    line-height: 1.7;
}

/* Language toggle container */
.language-toggle-container {
    position: relative;
    margin-left: 15px;
    display: flex;
    align-items: center;
}

.language-toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 60px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.language-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.language-toggle-btn:active {
    transform: translateY(0);
}

.lang-symbol {
    font-size: 16px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lang-arrow {
    font-size: 8px;
    transition: transform 0.3s ease;
    opacity: 0.7;
}

.language-toggle-container:hover .lang-arrow {
    opacity: 1;
}

/* Language switcher (legacy) */
.language-switcher {
    position: relative;
    margin-left: 15px;
}

.language-switcher-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.language-switcher-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.language-icon {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.2);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
    font-weight: 500;
    border-bottom: 1px solid #f0f0f0;
}

.language-option:last-child {
    border-bottom: none;
}

.language-option:first-child {
    border-radius: 12px 12px 0 0;
}

.language-option:last-child {
    border-radius: 0 0 12px 12px;
}

.language-option:hover {
    background: #f8f9fa;
    transform: translateX(4px);
}

.language-option.active {
    background: #e3f2fd;
    color: var(--primary-color);
    font-weight: 600;
}

.language-flag {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.language-flag.zh {
    background: #ff6b6b;
    color: white;
}

.language-flag.en {
    background: #4299e1;
    color: white;
}

/* 导航栏语言切换器（深色背景适配） */
.navbar .language-switcher-toggle {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-color: rgba(255, 255, 255, 0.2);
}

.navbar .language-switcher-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 页脚语言切换器（浅色背景适配） */
.footer .language-switcher-toggle {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-color: rgba(255, 255, 255, 0.2);
}

/* 语言切换动画 */
.language-switching {
    position: relative;
}

.language-switching::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    z-index: 9999;
    pointer-events: none;
    animation: languageSwitchFade 0.3s ease-in-out;
}

@keyframes languageSwitchFade {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

/* 语言切换加载状态 */
.language-loading .language-toggle-btn {
    pointer-events: none;
    opacity: 0.7;
}

.language-loading .lang-symbol {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* 语言提示消息 */
.language-tooltip {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    color: #333;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;

    /* 严格的尺寸控制 */
    max-width: 300px;
    min-width: 120px;
    width: fit-content;
    height: fit-content;
    max-height: 100px;
    overflow: hidden;

    /* 文本处理 */
    word-wrap: break-word;
    overflow-wrap: break-word;
    box-sizing: border-box;
    line-height: 1.4;

    /* 防止影响其他元素 */
    display: block;
    float: none;
    clear: both;
    margin: 0;
}

.language-tooltip.show {
    opacity: 1;
    transform: translateY(0);
}

.language-tooltip.success {
    background: #4caf50;
    color: white;
}

.language-tooltip.error {
    background: #f44336;
    color: white;
}

.language-tooltip.info {
    background: #2196f3;
    color: white;
}

/* 确保提示框不会影响页面布局 */
.language-tooltip:not(.show) {
    pointer-events: none;
}

.language-tooltip.show {
    pointer-events: auto;
}

/* 导航栏语言切换器（适配不同背景） */

/* 默认深色/渐变背景适配（如演示页面） */
.navbar[data-bg="dark"] .language-toggle-btn,
.navbar:not([data-bg]):not([style*="background: white"]) .language-toggle-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.navbar[data-bg="dark"] .language-toggle-btn:hover,
.navbar:not([data-bg]):not([style*="background: white"]) .language-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 白色背景适配（如主页和实际网站页面） */
.navbar[data-bg="light"] .language-toggle-btn,
.navbar.navbar-light-bg .language-toggle-btn,
.navbar[style*="background: white"] .language-toggle-btn,
.navbar[style*="background: #ffffff"] .language-toggle-btn,
.navbar[style*="background-color: white"] .language-toggle-btn,
.navbar[style*="background-color: #ffffff"] .language-toggle-btn,
.navbar[style*="background: var(--bg-white)"] .language-toggle-btn,
.navbar:has(.nav-logo a[href*="index.html"]) .language-toggle-btn {
    background: var(--primary-color, #1a365d);
    color: white;
    border-color: var(--primary-color, #1a365d);
    box-shadow: 0 2px 8px rgba(26, 54, 93, 0.2);
}

.navbar[data-bg="light"] .language-toggle-btn:hover,
.navbar.navbar-light-bg .language-toggle-btn:hover,
.navbar[style*="background: white"] .language-toggle-btn:hover,
.navbar[style*="background: #ffffff"] .language-toggle-btn:hover,
.navbar[style*="background-color: white"] .language-toggle-btn:hover,
.navbar[style*="background-color: #ffffff"] .language-toggle-btn:hover,
.navbar[style*="background: var(--bg-white)"] .language-toggle-btn:hover,
.navbar:has(.nav-logo a[href*="index.html"]) .language-toggle-btn:hover {
    background: var(--secondary-color, #2d5a87);
    border-color: var(--secondary-color, #2d5a87);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(26, 54, 93, 0.3);
}

/* 通用样式增强 */
.navbar .language-toggle-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: none;
}

.navbar .language-toggle-btn:focus {
    outline: 2px solid var(--accent-color, #3182ce);
    outline-offset: 2px;
}

.navbar .lang-arrow {
    transition: transform 0.3s ease;
    font-size: 8px;
    opacity: 0.8;
}

.navbar .language-toggle-container:hover .lang-arrow {
    opacity: 1;
    transform: translateY(1px);
}

/* 语言下拉菜单 */
.navbar .language-dropdown {
    background: white;
    color: #333;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.navbar .language-option {
    color: #333;
    border-bottom: 1px solid #f0f0f0;
}

.navbar .language-option:hover {
    background-color: #f8f9fa;
    color: var(--primary-color, #1a365d);
}

.navbar .language-option.active {
    background-color: #e3f2fd;
    color: var(--primary-color, #1a365d);
    font-weight: 600;
}

/* 语言旗帜样式增强 */
.navbar .language-flag.zh {
    background: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
    box-shadow: 0 2px 4px rgba(255, 71, 87, 0.2);
}

.navbar .language-flag.en {
    background: linear-gradient(135deg, #0093E9 0%, #80D0C7 100%);
    box-shadow: 0 2px 4px rgba(0, 147, 233, 0.2);
}

.navbar .language-flag {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .language-toggle-container {
        margin-left: 10px;
    }

    .navbar .language-toggle-btn {
        padding: 8px 12px;
        min-width: 50px;
        font-size: 13px;
    }

    .navbar .lang-symbol {
        font-size: 15px;
    }

    .navbar .lang-arrow {
        font-size: 7px;
    }

    .navbar .language-dropdown {
        min-width: 140px;
        right: -10px;
    }
}

@media (max-width: 480px) {
    .navbar .language-toggle-container {
        margin-left: 8px;
    }

    .navbar .language-toggle-btn {
        padding: 6px 10px;
        min-width: 45px;
        font-size: 12px;
    }

    .navbar .language-option {
        padding: 10px 12px;
        font-size: 14px;
    }
}

/* 页面语言类 */
html[data-lang="en"] {
    /* 英文页面字体设置 */
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

 html[data-lang="zh-CN"] {
    /* 中文页面字体设置 */
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

/* 英文页面排版优化 */
 html[data-lang="en"] .hero-title {
    font-size: 42px;
    line-height: 1.2;
}

 html[data-lang="en"] .section-header h2 {
    font-size: 36px;
    line-height: 1.3;
}

/* 响应式语言切换器 */
@media (max-width: 768px) {
    .language-switcher {
        margin-left: 10px;
    }

    .language-switcher-toggle {
        padding: 6px 12px;
        font-size: 12px;
    }

    .language-icon {
        width: 16px;
        height: 16px;
        font-size: 10px;
    }

    .language-dropdown {
        min-width: 120px;
        right: -10px;
    }

    .language-option {
        padding: 10px 12px;
        font-size: 14px;
    }
}

/* 语言切换动画 */
.language-switching {
    position: relative;
    overflow: hidden;
}

.language-switching::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: languageSwitch 0.6s ease;
}

@keyframes languageSwitch {
    0% {
        left: -100%;
    }
    50% {
        left: 0%;
    }
    100% {
        left: 100%;
    }
}

/* 英文页面特定样式调整 */
 html[data-lang="en"] .feature-card h3,
 html[data-lang="en"] .system-info h3,
 html[data-lang="en"] .section-header h2 {
    line-height: 1.3;
    word-spacing: -0.5px;
}

 html[data-lang="en"] .hero-subtitle {
    max-width: 600px;
    line-height: 1.5;
}

/* 加载状态 */
.language-loading {
    opacity: 0.6;
    pointer-events: none;
}

.language-loading .language-switcher-toggle {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* 错误状态 */
.language-error .language-switcher-toggle {
    background: #f56565;
    border-color: #e53e3e;
}

/* 成功状态 */
.language-success .language-switcher-toggle {
    background: #48bb78;
    border-color: #38a169;
}


/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .language-switcher-toggle {
        border-width: 3px;
    }

    .language-option:hover {
        background: #000;
        color: #fff;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    .language-switcher-toggle,
    .language-dropdown,
    .language-option {
        transition: none;
    }

    .language-switching::before {
        animation: none;
    }
}

/* 最终备用规则 - 确保在白色导航栏背景下的可见性 */
.navbar .language-toggle-btn {
    /* 默认使用深色按钮样式，适合白色背景 */
    background: var(--primary-color, #1a365d);
    color: white;
    border-color: var(--primary-color, #1a365d);
}

.navbar .language-toggle-btn:hover {
    background: var(--secondary-color, #2d5a87);
    border-color: var(--secondary-color, #2d5a87);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(26, 54, 93, 0.3);
}

/* 深色背景时覆盖上述规则 */
.navbar[data-bg="dark"] .language-toggle-btn,
.navbar.navbar-dark-bg .language-toggle-btn,
.navbar[style*="background: rgba"] .language-toggle-btn,
.navbar[style*="background: linear-gradient"] .language-toggle-btn,
.navbar[style*="background: #000"] .language-toggle-btn,
.navbar[style*="background: #1"] .language-toggle-btn,
.navbar[style*="background: #2"] .language-toggle-btn,
.navbar[style*="background: #3"] .language-toggle-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.navbar[data-bg="dark"] .language-toggle-btn:hover,
.navbar.navbar-dark-bg .language-toggle-btn:hover,
.navbar[style*="background: rgba"] .language-toggle-btn:hover,
.navbar[style*="background: linear-gradient"] .language-toggle-btn:hover,
.navbar[style*="background: #000"] .language-toggle-btn:hover,
.navbar[style*="background: #1"] .language-toggle-btn:hover,
.navbar[style*="background: #2"] .language-toggle-btn:hover,
.navbar[style*="background: #3"] .language-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}