/* 关键CSS - 首屏渲染优化 */
.main-content {
    padding-top: 76px;
    min-height: calc(100vh - 76px);
    overflow-x: hidden;
}

/* 容器优化 */
.container {
    max-width: 100%;
    padding-left: 15px;
    padding-right: 15px;
}

/* 响应式容器优化 */
@media (min-width: 576px) {
    .container {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}

/* 卡片和内容区域优化 */
.card {
    margin-bottom: 1.5rem;
    border: none;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* 网格布局优化 */
.row {
    margin-left: -15px;
    margin-right: -15px;
}

.col, .col-md-4, .col-md-6, .col-lg-3, .col-lg-4, .col-lg-6 {
    padding-left: 15px;
    padding-right: 15px;
}

/* 图片响应式优化 */
.card-img-top {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-img-top {
    transform: scale(1.05);
}

/* 文本内容优化 */
.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.card-text {
    font-size: 0.9rem;
    line-height: 1.5;
    color: #666;
}

/* 按钮优化 */
.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #007bff, #0056b3);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0056b3, #004085);
    transform: translateY(-1px);
}

/* 导航栏优化 - 防止文字换行 */
.navbar-nav {
    white-space: nowrap;
    flex-wrap: nowrap;
}

.navbar-nav .nav-link {
    white-space: nowrap;
    font-size: 0.85rem;
    padding: 0.5rem 0.6rem;
    transition: all 0.2s ease;
}

/* 导航栏容器优化 */
.navbar .container {
    max-width: 100%;
    padding-left: 15px;
    padding-right: 15px;
}

/* 品牌名称优化 */
.navbar-brand {
    font-size: 1.1rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

/* 小屏幕桌面设备优化 (1024px-1199px) */
@media (min-width: 1024px) and (max-width: 1199px) {
    .navbar-nav .nav-link {
        font-size: 0.8rem;
        padding: 0.5rem 0.5rem;
    }
    
    .navbar-nav .nav-link i {
        margin-right: 0.25rem;
        font-size: 0.75rem;
    }
    
    .navbar-brand {
        font-size: 1rem;
    }
}

/* 中等屏幕导航栏优化 (992px-1023px) */
@media (min-width: 992px) and (max-width: 1023px) {
    .navbar-nav .nav-link {
        font-size: 0.75rem;
        padding: 0.5rem 0.4rem;
    }
    
    .navbar-nav .nav-link i {
        margin-right: 0.2rem;
        font-size: 0.7rem;
    }
    
    .navbar-brand {
        font-size: 0.95rem;
    }
    
    /* 隐藏部分图标以节省空间 */
    .navbar-nav .nav-link i {
        display: none;
    }
}

/* 大屏幕导航栏优化 */
@media (min-width: 1200px) {
    .navbar-nav .nav-link {
        font-size: 0.9rem;
        padding: 0.5rem 0.75rem;
    }
    
    .navbar-nav .nav-link i {
        margin-right: 0.4rem;
    }
}

/* 超大屏幕优化 */
@media (min-width: 1400px) {
    .navbar-nav .nav-link {
        font-size: 0.95rem;
        padding: 0.5rem 0.8rem;
    }
}

/* 预加载关键字体和图标 */
@font-face {
    font-family: 'FontAwesome';
    font-display: swap;
}

/* 优化动画性能 */
.fade-in {
    animation: fadeIn 0.3s ease-in;
    will-change: opacity, transform;
}

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

/* 响应式设计优化 */
@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .display-2 {
        font-size: 2.5rem;
    }
    
    /* 移动端导航栏优化 */
    .navbar-brand {
        font-size: 1.1rem;
        padding: 0.5rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        white-space: normal; /* 移动端允许换行 */
    }
    
    .navbar-nav .nav-link:last-child {
        border-bottom: none;
    }
    
    .navbar-collapse {
        margin-top: 0.5rem;
        padding-top: 0.5rem;
        border-top: 1px solid rgba(255,255,255,0.1);
        max-height: calc(100vh - 120px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 确保导航栏内容不被遮挡 */
    .main-content {
        padding-top: 80px;
    }
}

/* 卡片悬停效果优化 */
.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    will-change: transform;
}

/* 点击次数统计样式 */
.click-count {
    font-size: 0.8em;
    color: rgba(255, 255, 255, 0.8);
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.click-count i {
    font-size: 0.9em;
}

.count-number {
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

/* 点击动画效果 */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.click-count.animate {
    animation: pulse 0.3s ease-in-out;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

/* 按钮样式优化 */
.btn {
    border-radius: 8px;
    transition: all 0.2s ease;
    will-change: transform;
}

.btn:hover {
    transform: translateY(-1px);
}

/* 导航栏样式优化 */
.navbar-brand {
    font-weight: bold;
}

.nav-link {
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: rgba(255,255,255,0.8) !important;
}

/* 页脚样式 */
footer {
    margin-top: auto;
}

/* 加载动画优化 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    will-change: transform;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 评论回复表单样式 */
.reply-form {
    display: none;
    margin-top: 10px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 3px solid #007bff;
}

.comment-item {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    background-color: #fff;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.comment-author {
    font-weight: bold;
    color: #007bff;
}

.comment-time {
    color: #6c757d;
    font-size: 0.875rem;
}

.comment-content {
    margin-bottom: 10px;
    line-height: 1.6;
}

.comment-actions {
    margin-bottom: 10px;
}

.reply-item {
    margin-left: 20px;
    margin-top: 10px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 6px;
    border-left: 2px solid #28a745;
}

.no-comments {
    text-align: center;
    padding: 40px 20px;
    color: #6c757d;
}

/* 图片懒加载优化 */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-image.loaded {
    opacity: 1;
}

/* 内容预加载提示 */
.content-placeholder {
    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; }
}

/* 关键路径CSS优化 */
.hero-section {
    contain: layout style paint;
}

.quick-nav-section {
    contain: layout style;
}

/* 滚动性能优化 */
.scroll-container {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

/* 触摸设备优化 */
@media (hover: none) {
    .card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
}

/* 点击次数样式 */
.click-count {
    display: inline-flex;
    align-items: center;
    font-size: 0.8em;
    opacity: 0.8;
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 6px;
    border-radius: 12px;
    margin-left: 8px;
}

.click-count i {
    font-size: 0.9em;
    margin-right: 3px;
}

.count-number {
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

/* 点击动画 */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* 按钮悬停效果 */
.click-track-btn:hover .click-count {
    opacity: 1;
    background: rgba(255, 255, 255, 0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .click-count {
        font-size: 0.7em;
        padding: 1px 4px;
    }
}

/* 小屏幕设备优化 */
@media (max-width: 576px) {
    /* 导航栏品牌名称优化 */
    .navbar-brand {
        font-size: 1rem;
        padding: 0.4rem 0;
    }
    
    .navbar-brand i {
        font-size: 0.9rem;
    }
    
    /* 导航菜单项优化 */
    .navbar-nav .nav-link {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
        white-space: normal; /* 小屏幕允许换行 */
    }
    
    .navbar-nav .nav-link i {
        font-size: 0.8rem;
        margin-right: 0.4rem;
    }
    
    /* 汉堡菜单按钮优化 */
    .navbar-toggler {
        padding: 0.25rem 0.5rem;
        font-size: 0.9rem;
        border: 1px solid rgba(255,255,255,0.3);
    }
    
    /* 导航栏折叠菜单优化 */
    .navbar-collapse {
        max-height: calc(100vh - 100px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 主内容区域适配 */
    .main-content {
        padding-top: 75px;
    }
    
    /* 容器内边距优化 */
    .container {
        padding-left: 10px;
        padding-right: 10px;
    }
}

/* 超小屏幕设备优化 */
@media (max-width: 375px) {
    /* 导航栏品牌名称进一步优化 */
    .navbar-brand {
        font-size: 0.9rem;
        padding: 0.3rem 0;
    }
    
    .navbar-brand i {
        font-size: 0.8rem;
        margin-right: 0.3rem;
    }
    
    /* 导航菜单项进一步优化 */
    .navbar-nav .nav-link {
        padding: 0.5rem 0.6rem;
        font-size: 0.85rem;
        white-space: normal; /* 超小屏幕允许换行 */
    }
    
    .navbar-nav .nav-link i {
        font-size: 0.75rem;
        margin-right: 0.3rem;
    }
    
    /* 汉堡菜单按钮进一步优化 */
    .navbar-toggler {
        padding: 0.2rem 0.4rem;
        font-size: 0.8rem;
    }
    
    /* 导航栏折叠菜单进一步优化 */
    .navbar-collapse {
        max-height: calc(100vh - 90px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 主内容区域进一步适配 */
    .main-content {
        padding-top: 70px;
    }
    
    /* 容器内边距进一步优化 */
    .container {
        padding-left: 8px;
        padding-right: 8px;
    }
}