/* 
 * 基础样式文件 - 整合所有核心样式
 * 优化前端性能，减少内联CSS
 */

/* 导航下拉菜单样式 - 修复hover问题 */
.dropdown-menu {
    display: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease-in-out;
    pointer-events: none;
    z-index: 9999;
}

.group:hover .dropdown-menu,
.group:focus-within .dropdown-menu,
.dropdown-menu.show {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

/* 确保dropdown容器有正确的层级 */
.group {
    position: relative;
    z-index: 50;
}

/* 下拉菜单项hover效果 */
.dropdown-menu a:hover {
    background-color: rgba(139, 92, 246, 0.1);
    color: #8b5cf6;
    transition: all 0.2s ease-in-out;
}

/* 滚动时导航栏背景 */
.navbar-scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 移动端菜单样式优化 */
@media (max-width: 768px) {
    .dropdown-menu {
        position: static;
        display: block;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        margin-top: 0;
        padding-top: 0;
    }
    
    /* 移动端菜单按钮动画 */
    .mobile-menu-button svg {
        transition: transform 0.3s ease-in-out;
    }
}

/* 桌面端hover增强 */
@media (min-width: 769px) {
    .group:hover .dropdown-menu {
        animation: slideDown 0.3s ease-out;
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* QR码弹出层样式 */
.qr-code-popup {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    z-index: 50;
}

.group:hover .qr-code-popup {
    opacity: 1;
    visibility: visible;
}

/* Logo SVG渐变动画 */
.logo-svg .logo-icon {
    transition: transform 0.3s ease-in-out;
}

.logo-svg:hover .logo-icon {
    transform: scale(1.05);
}

/* 响应式图片优化 */
.responsive-img {
    width: 100%;
    height: auto;
    object-fit: cover;
    transition: transform 0.3s ease-in-out;
}

.responsive-img:hover {
    transform: scale(1.02);
}

/* 加载状态样式 */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 按钮悬停效果优化 */
.btn-primary {
    transition: all 0.2s ease-in-out;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 卡片组件优化 */
.card-hover {
    transition: all 0.3s ease-in-out;
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* 表单输入框焦点状态 */
.form-input:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* 移动端优化 */
@media (max-width: 768px) {
    .mobile-menu-item {
        padding: 12px 16px;
        border-left: 4px solid transparent;
        transition: all 0.2s ease-in-out;
    }
    
    .mobile-menu-item:hover {
        background-color: #f9fafb;
        border-left-color: #8b5cf6;
    }
}

/* 性能优化 - GPU加速 */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* 减少重绘的平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 图片懒加载占位符 */
.img-placeholder {
    background-color: #f3f4f6;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.img-placeholder::before {
    content: "⏳ 加载中...";
    color: #9ca3af;
    font-size: 14px;
}