/* =====================================================
   SEO服务网站样式表
   主题色调：深海蓝 (#1976D2) 主色
   辅助色彩：白色 (#FFFFFF)、浅灰色 (#F8F9FA)、深灰色 (#424242)
   强调色彩：活力橙 (#FF5722) 用于CTA按钮和重要信息
   ===================================================== */

/* =====================================================
   基础样式重置和通用设置
   ===================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #424242;
    background-color: #FFFFFF;
}

/* =====================================================
   颜色变量定义
   ===================================================== */
:root {
    --primary-color: #1976D2;
    --primary-dark: #1565C0;
    --primary-light: #42A5F5;
    --secondary-color: #FF5722;
    --secondary-dark: #E64A19;
    --secondary-light: #FF8A65;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #F44336;
    --info-color: #2196F3;
    --light-color: #F8F9FA;
    --dark-color: #424242;
    --white-color: #FFFFFF;
    --muted-color: #6C757D;
    --border-color: #E9ECEF;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
}

/* =====================================================
   通用工具类
   ===================================================== */

/* 文本颜色 */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-info { color: var(--info-color) !important; }
.text-dark { color: var(--dark-color) !important; }
.text-muted { color: var(--muted-color) !important; }

/* 背景颜色 */
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-info { background-color: var(--info-color) !important; }
.bg-light { background-color: var(--light-color) !important; }
.bg-dark { background-color: var(--dark-color) !important; }

/* 按钮样式增强 */
.btn {
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
}

.btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
}

.btn-warning:hover {
    background-color: #F57C00;
    border-color: #F57C00;
}

/* 悬停效果 */
.hover-primary:hover {
    color: var(--primary-color) !important;
    text-decoration: none;
}

.hover-warning:hover {
    color: var(--warning-color) !important;
    text-decoration: none;
}

/* 卡片样式增强 */
.card {
    border: none;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
    transform: translateY(-4px);
}

/* 阴影效果 */
.shadow-sm {
    box-shadow: 0 2px 8px var(--shadow-color) !important;
}

.shadow {
    box-shadow: 0 4px 12px var(--shadow-color) !important;
}

.shadow-lg {
    box-shadow: 0 8px 24px var(--shadow-color) !important;
}

/* =====================================================
   头部样式
   ===================================================== */

/* 顶部导航条 */
.top-bar {
    font-size: 0.875rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.top-bar-info span,
.top-bar-social span {
    display: inline-flex;
    align-items: center;
}

/* 主导航 */
.navbar-brand img {
    transition: all 0.3s ease;
}

.navbar-brand:hover img {
    transform: scale(1.05);
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
}

.navbar-nav .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: var(--primary-color);
}

/* 下拉菜单 */
.dropdown-menu {
    border: none;
    box-shadow: 0 4px 12px var(--shadow-color);
    border-radius: 8px;
    margin-top: 8px;
}

.dropdown-item {
    padding: 8px 16px;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

/* 面包屑导航 */
.breadcrumb-section {
    background-color: var(--light-color);
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-item a:hover {
    color: var(--primary-dark);
}

/* =====================================================
   首页样式
   ===================================================== */

/* Hero轮播区域 */
.hero-slider-section {
    position: relative;
    overflow: hidden;
}

#heroCarousel .carousel-item {
    min-height: 200px;
    position: relative;
}

#heroCarousel .carousel-item img {
    object-fit: cover;
    object-position: center;
}

#heroCarousel .carousel-caption {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(25, 118, 210, 0.8), rgba(21, 101, 192, 0.6));
}

.carousel-caption h1 {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: 1rem;
}

.carousel-caption .lead {
    font-size: 1.25rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
}

/* 轮播控制按钮 */
.carousel-control-prev,
.carousel-control-next {
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    transition: all 0.3s ease;
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* 轮播指示器 */
.carousel-indicators button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    margin: 0 4px;
    transition: all 0.3s ease;
}

.carousel-indicators button.active {
    background-color: var(--warning-color);
    transform: scale(1.2);
}

/* 动画效果 */
.animate-text {
    animation: fadeInUp 1s ease-out;
}

.animate-text-delay {
    animation: fadeInUp 1s ease-out 0.3s both;
}

.animate-buttons {
    animation: fadeInUp 1s ease-out 0.6s both;
}

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

/* 服务概览区域 */
.services-overview-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.service-card {
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.service-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
}

.service-card.border-start-warning .service-icon {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

/* 统计数字动画 */
.statistics-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.statistics-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.1;
}

.stat-item {
    position: relative;
    z-index: 1;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--white-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.stat-label {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 0.5rem;
}

/* 案例展示区域 */
.case-studies-section {
    background-color: var(--white-color);
}

.case-card {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.case-image {
    position: relative;
    overflow: hidden;
}

.case-overlay {
    transition: all 0.3s ease;
    opacity: 0;
}

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-category {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    font-size: 0.75rem;
    font-weight: 600;
}

.case-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--dark-color);
    transition: color 0.3s ease;
}

.case-title:hover {
    color: var(--primary-color);
}

.case-description {
    line-height: 1.6;
    color: var(--muted-color);
}

/* SEO流程区域 */
.seo-process-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.process-step {
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.process-step:hover {
    transform: translateY(-4px);
}

.process-number {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    font-size: 1.5rem;
    font-weight: 700;
}

.process-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.process-description {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--muted-color);
}

.process-flow {
    margin-top: 2rem;
}

.process-flow i {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* 价格套餐区域 */
.pricing-section {
    background-color: var(--white-color);
}

.pricing-card {
    position: relative;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.pricing-card.border-warning {
    border-color: var(--warning-color);
}

.popular-badge {
    font-size: 0.75rem;
    font-weight: 600;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.price-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.price-currency {
    font-size: 1.5rem;
    color: var(--muted-color);
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    font-size: 1rem;
    color: var(--muted-color);
}

.guarantee-badge {
    font-size: 0.75rem;
    font-weight: 600;
}

.pricing-features ul li {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.pricing-features ul li:last-child {
    border-bottom: none;
}

/* 城市目录区域 */
.city-directory-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.city-btn {
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    margin: 0.25rem;
    transition: all 0.3s ease;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.city-btn:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(25, 118, 210, 0.3);
}

/* 最新资讯区域 */
.latest-news-section {
    background-color: var(--white-color);
}

.news-card {
    transition: all 0.3s ease;
    overflow: hidden;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.news-image {
    position: relative;
    overflow: hidden;
}

.news-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    font-size: 0.75rem;
    font-weight: 600;
}

.news-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.news-title a {
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-title a:hover {
    color: var(--primary-color);
}

.news-excerpt {
    line-height: 1.6;
    color: var(--muted-color);
    margin-bottom: 1rem;
}

.news-meta {
    font-size: 0.875rem;
    color: var(--muted-color);
}

/* CTA区域 */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>');
}

.cta-features .col-md-4 {
    margin-bottom: 1rem;
}

.cta-features .d-flex {
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

/* =====================================================
   资讯页面样式
   ===================================================== */

/* 页面头部 */
.page-header-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.page-header-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
}

.breadcrumb-dark .breadcrumb-item.active {
    color: var(--warning-color) !important;
}

/* 特色文章 */
.featured-article {
    transition: all 0.3s ease;
    overflow: hidden;
}

.featured-article:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.featured-image {
    position: relative;
    overflow: hidden;
}

.featured-category {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    font-size: 0.875rem;
    font-weight: 600;
}

.featured-title {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

.featured-title a {
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.featured-title a:hover {
    color: var(--primary-color);
}

.featured-excerpt {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--muted-color);
    margin-bottom: 1.5rem;
}

.featured-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* 文章列表 */
.article-item {
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.article-image img {
    object-fit: cover;
    border-radius: 8px;
}

.article-category {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    color: var(--white-color);
    display: inline-block;
    margin-bottom: 0.75rem;
}

.article-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.article-title a {
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-excerpt {
    line-height: 1.6;
    color: var(--muted-color);
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.meta-tags .badge {
    font-size: 0.75rem;
    margin-right: 0.5rem;
    margin-bottom: 0.25rem;
}

/* 侧边栏 */
.sidebar-widget {
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.sidebar-widget:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px var(--shadow-hover);
}

.widget-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.category-list .category-item {
    margin-bottom: 0.5rem;
}

.category-item a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--dark-color);
}

.category-item a:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
    transform: translateX(4px);
}

.popular-articles .popular-article {
    display: flex;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.popular-articles .popular-article:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.article-thumb {
    flex-shrink: 0;
}

.article-thumb img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
}

.article-info {
    margin-left: 1rem;
}

.article-info h6 {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.article-info h6 a {
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.article-info h6 a:hover {
    color: var(--primary-color);
}

.tag-cloud .badge {
    font-size: 0.75rem;
    margin: 0.25rem;
    padding: 0.5rem 0.75rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.tag-cloud .badge:hover {
    background-color: var(--primary-color) !important;
    color: var(--white-color) !important;
    transform: translateY(-2px);
}

/* =====================================================
   文章详情页样式
   ===================================================== */

/* 文章头部 */
.article-header-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.category-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    font-size: 0.875rem;
    font-weight: 600;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--muted-color);
}

.article-meta span {
    display: flex;
    align-items: center;
}

.article-meta i {
    margin-right: 0.5rem;
}

.article-tags .badge {
    font-size: 0.75rem;
    margin: 0.25rem;
    padding: 0.5rem 0.75rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.article-tags .badge:hover {
    background-color: var(--primary-color) !important;
    color: var(--white-color) !important;
}

/* 文章内容 */
.article-content-section {
    background-color: var(--white-color);
}

.article-main {
    transition: all 0.3s ease;
}

.article-main:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.article-image {
    text-align: center;
    margin-bottom: 2rem;
}

.article-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* 文章内容样式 */
.content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--dark-color);
}

.content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 2rem 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
    margin: 1.5rem 0 0.75rem 0;
}

.content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 1rem 0 0.5rem 0;
}

.content p {
    margin-bottom: 1.5rem;
}

.content ul,
.content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.content li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.content strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 文章操作 */
.article-actions {
    border-top: 2px solid var(--border-color);
    padding-top: 2rem;
    margin-top: 3rem;
}

.social-share .btn {
    margin-right: 0.5rem;
    transition: all 0.3s ease;
}

.social-share .btn:hover {
    transform: translateY(-2px);
}

/* 作者信息 */
.author-info {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
    border-left: 4px solid var(--primary-color);
}

.author-avatar img {
    border: 3px solid var(--primary-color);
}

.author-name {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.author-bio {
    line-height: 1.6;
    color: var(--muted-color);
    margin-bottom: 1rem;
}

/* 相关文章 */
.related-articles {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.related-article {
    transition: all 0.3s ease;
}

.related-article:hover {
    transform: translateY(-4px);
}

.related-image img {
    border-radius: 8px;
    transition: all 0.3s ease;
}

.related-article:hover .related-image img {
    transform: scale(1.05);
}

.related-title {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.related-title a {
    color: var(--dark-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.related-title a:hover {
    color: var(--primary-color);
}

/* 评论区域 */
.comments-section {
    background-color: var(--white-color);
}

.comment-form {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.comment-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.comment-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.comment-avatar img {
    border-radius: 50%;
    border: 2px solid var(--primary-color);
}

.comment-author {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.comment-text {
    line-height: 1.6;
    margin-bottom: 1rem;
}

.comment-actions .btn {
    margin-right: 0.5rem;
}

/* 文章目录 */
.article-toc .nav-link {
    font-size: 0.875rem;
    color: var(--muted-color);
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}

.article-toc .nav-link:hover {
    color: var(--primary-color);
    padding-left: 0.5rem;
}

/* =====================================================
   关于我们页面样式
   ===================================================== */

/* 公司介绍 */
.company-intro-section {
    background-color: var(--white-color);
}

.company-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.company-content .lead {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--muted-color);
    margin-bottom: 2rem;
}

.highlight-item {
    padding: 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.highlight-item:hover {
    background-color: var(--light-color);
    transform: translateX(8px);
}

.highlight-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
}

/* 公司统计 */
.company-stats-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.stat-card {
    text-align: center;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.stat-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    margin-bottom: 1.5rem;
}

.stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, var(--info-color), #42A5F5);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* 团队区域 */
.team-section {
    background-color: var(--white-color);
}

.team-card {
    text-align: center;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.team-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.team-avatar img {
    border: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.team-card:hover .team-avatar img {
    transform: scale(1.1);
    border-color: var(--primary-light);
}

.team-name {
    color: var(--primary-color);
    margin: 1rem 0 0.5rem 0;
}

.team-position {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.team-bio {
    line-height: 1.6;
    color: var(--muted-color);
    margin-bottom: 1.5rem;
}

.team-social .btn {
    margin: 0 0.25rem;
    transition: all 0.3s ease;
}

.team-social .btn:hover {
    transform: translateY(-2px);
}

/* 服务概览 */
.services-overview-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.service-item {
    padding: 2rem;
    transition: all 0.3s ease;
}

.service-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.service-header {
    margin-bottom: 1.5rem;
}

.service-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
}

.service-item:nth-child(2) .service-icon {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.service-title {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.service-item:nth-child(2) .service-title {
    color: var(--warning-color);
}

.service-description {
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* 企业文化 */
.company-culture-section {
    background-color: var(--white-color);
}

.culture-card {
    text-align: center;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.culture-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.culture-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    margin-bottom: 1.5rem;
}

.culture-card:nth-child(2) .culture-icon {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.culture-card:nth-child(3) .culture-icon {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.culture-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.culture-card:nth-child(2) .culture-title {
    color: var(--warning-color);
}

.culture-card:nth-child(3) .culture-title {
    color: var(--success-color);
}

.culture-description {
    line-height: 1.6;
    color: var(--muted-color);
}

/* 发展历程 */
.company-history-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-light));
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-content {
    padding: 2rem;
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.timeline-year {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.timeline-description {
    line-height: 1.6;
    color: var(--muted-color);
}

.timeline-image img {
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.timeline-image img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

/* =====================================================
   联系我们页面样式
   ===================================================== */

/* 联系方式卡片 */
.contact-methods-section {
    background-color: var(--white-color);
}

.contact-card {
    text-align: center;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.contact-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    margin-bottom: 1.5rem;
}

.contact-card:nth-child(2) .contact-icon {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.contact-card:nth-child(3) .contact-icon {
    background: linear-gradient(135deg, var(--info-color), #42A5F5);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.contact-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-card:nth-child(2) .contact-title {
    color: var(--success-color);
}

.contact-card:nth-child(3) .contact-title {
    color: var(--info-color);
}

.contact-description {
    line-height: 1.6;
    color: var(--muted-color);
    margin-bottom: 1.5rem;
}

.contact-info {
    margin-bottom: 1.5rem;
}

.contact-number,
.contact-wechat,
.contact-email {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.wechat-qr {
    margin: 1rem 0;
}

.wechat-qr img {
    border: 2px solid var(--success-color);
    border-radius: 8px;
    padding: 0.5rem;
    background-color: var(--white-color);
}

/* 联系表单 */
.contact-form-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.contact-form-container {
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.contact-form-container:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.form-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.form-control,
.form-select {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(25, 118, 210, 0.25);
    outline: none;
}

.form-control-lg {
    padding: 1rem 1.25rem;
    font-size: 1.1rem;
}

.form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

/* 公司信息 */
.company-info {
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.company-info:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
    transform: translateY(-4px);
}

.info-content .info-item {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.info-content .info-item:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
    transform: translateX(4px);
}

.info-content .info-item:hover strong,
.info-content .info-item:hover span {
    color: var(--white-color);
}

/* 常见问题 */
.faq-widget {
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.faq-widget:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.faq-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.faq-answer {
    line-height: 1.6;
    color: var(--muted-color);
}

/* 服务保障 */
.guarantee-widget {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 12px;
    color: var(--white-color);
}

.guarantee-widget ul li {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.guarantee-widget ul li:last-child {
    margin-bottom: 0;
}

.guarantee-widget i {
    margin-right: 0.5rem;
    color: var(--warning-color);
}

/* 地图区域 */
.map-section {
    background-color: var(--white-color);
}

.map-container {
    background-color: var(--white-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.map-placeholder {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    color: var(--muted-color);
}

.map-placeholder i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* =====================================================
   网站SEO获客页面样式
   ===================================================== */

/* Hero区域 */
.web-seo-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.web-seo-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="seo-pattern" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23seo-pattern)"/></svg>');
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-image {
    position: relative;
}

.hero-stats {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    color: var(--white-color);
    text-align: center;
    border-radius: 8px;
    padding: 1rem;
}

/* SEO优势 */
.seo-benefits-section {
    background-color: var(--white-color);
}

.benefit-card {
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.benefit-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.benefit-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
    margin-bottom: 1.5rem;
}

.benefit-card.border-start-warning .benefit-icon {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.benefit-card.border-start-success .benefit-icon {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.benefit-title {
    margin-bottom: 1rem;
}

.benefit-description {
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.benefit-stats .stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.benefit-stats .stat-item:last-child {
    border-bottom: none;
}

/* 技术工具 */
.seo-tools-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.tool-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: all 0.3s ease;
    margin-bottom: 1rem;
}

.tool-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow-hover);
}

.tool-item i {
    margin-right: 1rem;
}

.tech-features .tech-item {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: all 0.3s ease;
}

.tech-features .tech-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

/* =====================================================
   短视频SEO获客页面样式
   ===================================================== */

/* Hero区域 */
.video-seo-hero {
    background: linear-gradient(135deg, var(--warning-color), #F57C00);
    position: relative;
    overflow: hidden;
}

.video-seo-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="video-pattern" x="0" y="0" width="15" height="15" patternUnits="userSpaceOnUse"><circle cx="7.5" cy="7.5" r="1" fill="rgba(0,0,0,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23video-pattern)"/></svg>');
}

.video-seo-hero .hero-stats {
    background: linear-gradient(135deg, var(--dark-color), #424242);
}

/* 平台覆盖 */
.platform-section {
    background-color: var(--white-color);
}

.platform-card {
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px var(--shadow-hover);
}

.platform-icon {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    margin-bottom: 1.5rem;
}

.platform-card.border-start-danger .platform-icon {
    background: linear-gradient(135deg, var(--danger-color), #EF5350);
    box-shadow: 0 4px 12px rgba(244, 67, 54, 0.3);
}

.platform-card.border-start-pink .platform-icon {
    background: linear-gradient(135deg, #E91E63, #F06292);
    box-shadow: 0 4px 12px rgba(233, 30, 99, 0.3);
}

.platform-card.border-start-orange .platform-icon {
    background: linear-gradient(135deg, #FF9800, #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.platform-title {
    margin-bottom: 0.5rem;
}

.platform-subtitle {
    color: var(--muted-color);
    margin-bottom: 1.5rem;
}

.platform-features ul li {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.platform-features ul li:last-child {
    margin-bottom: 0;
}

.platform-stats .stat-item {
    text-align: center;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: 8px;
}

/* 服务流程 */
.service-process-section {
    background: linear-gradient(135deg, var(--light-color), var(--white-color));
}

.service-process-section .process-number {
    background: linear-gradient(135deg, var(--warning-color), #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

/* 服务优势 */
.service-advantages-section {
    background-color: var(--white-color);
}

.advantage-card {
    padding: 2rem;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.advantage-icon {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
}

.advantage-card .advantage-icon.bg-danger {
    background: linear-gradient(135deg, var(--danger-color), #EF5350);
    box-shadow: 0 4px 12px rgba(244, 67, 54, 0.3);
}

.advantage-card .advantage-icon.bg-pink {
    background: linear-gradient(135deg, #E91E63, #F06292);
    box-shadow: 0 4px 12px rgba(233, 30, 99, 0.3);
}

.advantage-card .advantage-icon.bg-orange {
    background: linear-gradient(135deg, #FF9800, #FFB74D);
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.advantage-card .advantage-icon.bg-success {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.advantage-title {
    margin-bottom: 1rem;
}

.advantage-description {
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* =====================================================
   底部样式
   ===================================================== */

.site-footer {
    background: linear-gradient(135deg, #1a1a1a, #2d2d2d);
    color: var(--white-color);
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="footer-pattern" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23footer-pattern)"/></svg>');
}

.footer-widget {
    position: relative;
    z-index: 1;
}

.footer-logo {
    margin-bottom: 1.5rem;
}

.footer-logo img {
    margin-bottom: 1rem;
}

.footer-contact .contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.footer-contact .contact-item i {
    margin-right: 0.5rem;
    color: var(--warning-color);
}

.wechat-qr {
    text-align: center;
    margin-top: 1rem;
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.wechat-qr h6 {
    margin-bottom: 0.5rem;
    color: var(--white-color);
}

.wechat-qr img {
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.footer-links ul {
    list-style: none;
    padding: 0;
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-links ul li a {
    color: var(--light-color);
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
}

.footer-links ul li a:hover {
    color: var(--warning-color);
    transform: translateX(4px);
}

.footer-links ul li a i {
    margin-right: 0.5rem;
    font-size: 0.75rem;
}

.footer-news-item {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-news-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.footer-news-item a {
    color: var(--light-color);
    text-decoration: none;
    transition: color 0.3s ease;
    display: block;
    margin-bottom: 0.25rem;
}

.footer-news-item a:hover {
    color: var(--warning-color);
}

.newsletter-form .input-group {
    margin-bottom: 1rem;
}

.newsletter-form .form-control {
    border: none;
    border-radius: 8px 0 0 8px;
    padding: 0.75rem;
}

.newsletter-form .btn {
    border-radius: 0 8px 8px 0;
    padding: 0.75rem 1rem;
}

.social-links {
    margin-top: 1rem;
}

.social-links a {
    color: var(--white-color);
    margin-right: 0.5rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--warning-color);
    transform: translateY(-2px);
}

/* 底部版权 */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    margin-top: 3rem;
}

.footer-links-bottom a {
    color: var(--light-color);
    text-decoration: none;
    transition: color 0.3s ease;
    margin-right: 1rem;
}

.footer-links-bottom a:hover {
    color: var(--warning-color);
}

/* =====================================================
   固定元素样式
   ===================================================== */

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(25, 118, 210, 0.3);
}

/* 浮动联系按钮 */
.floating-contact {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 1000;
}

.floating-contact .btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s infinite;
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* 加载遮罩 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-overlay .spinner-border {
    width: 3rem;
    height: 3rem;
}

/* =====================================================
   响应式设计
   ===================================================== */

/* 大屏幕 (≥1200px) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
    
    .display-4 {
        font-size: 3.5rem;
    }
    
    .display-5 {
        font-size: 3rem;
    }
}

/* 中等屏幕 (≥992px) */
@media (min-width: 992px) {
    .navbar-expand-lg .navbar-nav .nav-link {
        padding-right: 1rem;
        padding-left: 1rem;
    }
    
    .dropdown-menu {
        margin-top: 0;
        border-top-left-radius: 0;
        border-top-right-radius: 0;
    }
    
    .dropdown:hover .dropdown-menu {
        display: block;
    }
}

/* 小屏幕 (≥768px) */
@media (min-width: 768px) {
    .hero-stats {
        position: absolute;
        bottom: 1rem;
        left: 1rem;
    }
    
    .timeline::before {
        left: 50%;
    }
    
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 2rem;
    }
    
    .timeline-item:nth-child(odd) .timeline-content {
        margin-right: 2rem;
    }
}

/* 超小屏幕 (<768px) */
@media (max-width: 767.98px) {
    .display-4 {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 1.75rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .carousel-caption h1 {
        font-size: 1.5rem;
    }
    
    .carousel-caption .lead {
        font-size: 1rem;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .navbar-nav .nav-link:last-child {
        border-bottom: none;
    }
    
    .dropdown-menu {
        margin-top: 0;
        border: none;
        box-shadow: none;
    }
    
    .timeline::before {
        left: 2rem;
    }
    
    .timeline-content {
        margin-left: 4rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 40px;
        height: 40px;
    }
    
    .floating-contact {
        bottom: 1rem;
        left: 1rem;
    }
    
    .floating-contact .btn {
        width: 50px;
        height: 50px;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .footer-widget,
    .back-to-top,
    .floating-contact,
    .breadcrumb-section,
    .article-actions,
    .author-info,
    .related-articles,
    .comments-section,
    .sidebar-widget {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .content {
        font-size: 12pt;
    }
    
    .content h2 {
        font-size: 14pt;
    }
    
    .content h3 {
        font-size: 13pt;
    }
}

/* =====================================================
   特殊效果
   ===================================================== */

/* 渐变文字效果 */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* 发光效果 */
.glow-effect {
    box-shadow: 0 0 20px rgba(25, 118, 210, 0.3);
}

/* 边框动画 */
.border-animation {
    position: relative;
    overflow: hidden;
}

.border-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: border-animation 2s linear infinite;
}

@keyframes border-animation {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* 数字滚动效果 */
.counter {
    display: inline-block;
    font-variant-numeric: tabular-nums;
}

/* 视差滚动效果 */
.parallax-section {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

/* 毛玻璃效果 */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* =====================================================
   辅助类
   ===================================================== */

/* 显示/隐藏 */
.show { display: block !important; }
.hide { display: none !important; }

/* 透明度 */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

/* Z-index */
.z-index-1 { z-index: 1; }
.z-index-10 { z-index: 10; }
.z-index-100 { z-index: 100; }
.z-index-1000 { z-index: 1000; }

/* 边框圆角 */
.rounded-lg { border-radius: 12px; }
.rounded-xl { border-radius: 16px; }

/* 字体大小 */
.fs-7 { font-size: 0.75rem; }
.fs-8 { font-size: 0.625rem; }

/* 间距 */
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }
.gap-5 { gap: 3rem; }

/* =====================================================
   自定义滚动条
   ===================================================== */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* =====================================================
   选择文本样式
   ===================================================== */

::selection {
    background-color: var(--primary-color);
    color: var(--white-color);
}

::-moz-selection {
    background-color: var(--primary-color);
    color: var(--white-color);
}

/* =====================================================
   焦点样式
   ===================================================== */

:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: none;
}

/* =====================================================
   结束
   ===================================================== */