/* 基础样式 */
* {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
}

/* 导航样式 */
.nav-link {
    position: relative;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
}

.nav-link:hover {
    background-color: rgba(59, 130, 246, 0.1);
    color: #2563eb;
}

/* 语言切换按钮样式 */
.lang-btn {
    position: relative;
    overflow: hidden;
    font-weight: 500;
    border: 2px solid transparent;
    cursor: pointer;
    user-select: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

.lang-btn.active {
    background-color: #2563eb !important;
    color: white !important;
    border-color: #2563eb;
}

/* 移动端菜单样式 */
#mobile-menu {
    transition: all 0.3s ease;
    border-top: 1px solid #e5e7eb;
}

#mobile-menu.hidden {
    opacity: 0;
    transform: translateY(-10px);
}

#mobile-menu:not(.hidden) {
    opacity: 1;
    transform: translateY(0);
}

/* 特性卡片样式 */
.feature-card {
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* 下载按钮样式 */
.download-btn {
    transition: all 0.3s ease;
    min-width: 200px;
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* 评价卡片样式 */
.review-card {
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
    position: relative;
    overflow: hidden;
}

.review-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #06b6d4);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.review-card:hover::before {
    transform: scaleX(1);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

/* 页面加载动画 */
.page-loaded .feature-card,
.page-loaded .review-card {
    animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 语言切换动画 */
.lang-zh, .lang-en {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.lang-zh.hidden, .lang-en.hidden {
    opacity: 0;
    transform: translateY(-10px);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-link {
        padding: 0.75rem 0;
        margin: 0.25rem 0;
    }
    
    .lang-btn {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
    }
    
    .feature-card {
        margin-bottom: 1.5rem;
    }
    
    .download-btn {
        min-width: auto;
        width: 100%;
        justify-content: center;
    }
}

/* Hero区域渐变动画 */
.bg-gradient-to-r {
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 按钮悬停效果 */
.hover\\:bg-blue-50:hover {
    background-color: rgba(239, 246, 255, 0.8);
    backdrop-filter: blur(4px);
}

/* Footer链接动画 */
footer a {
    position: relative;
    transition: color 0.3s ease;
}

footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: currentColor;
    transition: width 0.3s ease;
}

footer a:hover::after {
    width: 100%;
}

/* 图片加载优化 */
img {
    transition: opacity 0.3s ease;
}

img:not([src]) {
    opacity: 0;
}

/* 无障碍访问改进 */
.lang-btn:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* 打印样式 */
@media print {
    .nav, .lang-btn, #mobile-menu-btn {
        display: none !important;
    }
    
    .feature-card, .review-card {
        box-shadow: none !important;
        border: 1px solid #e5e7eb !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .feature-card, .review-card {
        border: 2px solid #000;
    }
    
    .lang-btn {
        border: 2px solid currentColor;
    }
}

/* 动画减少模式支持 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .bg-gradient-to-r {
        animation: none;
    }
}