/* 国际化相关样式 */

/* 语言切换器基础样式 */
.language-switcher {
    position: relative;
    z-index: 1000;
}

.language-switcher button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    outline: none;
    transition: all 0.2s ease;
}

.language-switcher .lang-flag {
    display: inline-block;
    margin-right: 4px;
    font-size: 1.1em;
}

.language-switcher .lang-text {
    display: inline-block;
    font-size: 0.9em;
}

/* 下拉式语言切换器 */
.lang-dropdown {
    position: relative;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: #ffffff;
    background: rgba(0, 0, 0, 0.3);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    font-size: 0.9em;
}

.lang-current:hover {
    background: rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

.lang-arrow {
    transition: transform 0.2s ease;
    opacity: 0.7;
}

.lang-dropdown.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-options {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 4px 0 0 0;
    padding: 0;
    list-style: none;
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.lang-dropdown.open .lang-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-options li {
    margin: 0;
}

.lang-options .lang-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 10px 12px;
    color: #ffffff;
    text-align: left;
    border: none;
    background: none;
    font-size: 0.9em;
}

.lang-options .lang-switch:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lang-options .lang-switch.active {
    background: rgba(79, 172, 254, 0.2);
    color: #4facfe;
}

/* 按钮组式语言切换器 */
.lang-buttons {
    display: flex;
    gap: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.3);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.lang-buttons .lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    color: #ffffff;
    background: none;
    border: none;
    font-size: 0.9em;
    opacity: 0.7;
    transition: all 0.2s ease;
}

.lang-buttons .lang-switch:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

.lang-buttons .lang-switch.active {
    opacity: 1;
    background: rgba(79, 172, 254, 0.2);
    color: #4facfe;
}

.lang-buttons .lang-switch:not(:last-child) {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

/* 简单切换按钮 */
.lang-switch.simple {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: #ffffff;
    background: rgba(0, 0, 0, 0.3);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    font-size: 0.85em;
    opacity: 0.8;
    transition: all 0.2s ease;
}

.lang-switch.simple:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

/* 定位样式 */
.language-switcher.top-right {
    position: absolute;
    top: 20px;
    right: 20px;
}

.language-switcher.top-left {
    position: absolute;
    top: 20px;
    left: 20px;
}

.language-switcher.bottom-right {
    position: absolute;
    bottom: 20px;
    right: 20px;
}

.language-switcher.bottom-left {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 1001;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .language-switcher.top-right {
        top: 10px;
        right: 10px;
    }
    
    .language-switcher.bottom-left {
        bottom: 10px;
        left: 10px;
    }
    
    .language-switcher .lang-text {
        display: none;
    }
    
    .lang-current,
    .lang-buttons .lang-switch,
    .lang-switch.simple {
        padding: 6px 8px;
    }
    
    .lang-options .lang-switch {
        padding: 8px 10px;
    }
}

/* 主题适配 */
.dark-theme .language-switcher {
    --bg-color: rgba(255, 255, 255, 0.1);
    --text-color: #ffffff;
    --border-color: rgba(255, 255, 255, 0.2);
    --hover-bg: rgba(255, 255, 255, 0.2);
}

.light-theme .language-switcher {
    --bg-color: rgba(0, 0, 0, 0.1);
    --text-color: #333333;
    --border-color: rgba(0, 0, 0, 0.2);
    --hover-bg: rgba(0, 0, 0, 0.1);
}

/* 动画效果 */
.language-switcher button {
    position: relative;
    overflow: hidden;
}

.language-switcher button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
}

.language-switcher button:active::after {
    width: 200px;
    height: 200px;
}

/* 可访问性支持 */
.language-switcher button:focus {
    outline: 2px solid #4facfe;
    outline-offset: 2px;
}

.language-switcher [aria-expanded="true"] .lang-arrow {
    transform: rotate(180deg);
}

/* 语言切换加载动画 */
.language-switching {
    pointer-events: none;
    opacity: 0.6;
}

.language-switching::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 1s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}