* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 导航栏 ===== */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s;
}

nav a:hover {
    background: rgba(255,255,255,0.2);
}

.mobile-menu-btn {
    display: none;
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

/* ===== Hero 区域 ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    padding-top: 80px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* ===== 统计栏 ===== */
.stats-bar {
    background: white;
    padding: 3rem 0;
    margin-top: -50px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #667eea;
}

.stat-label {
    color: #666;
    margin-top: 0.5rem;
}

/* ===== 服务板块 ===== */
.section {
    padding: 4rem 0;
    background: white;
    margin: 2rem 0;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #667eea;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.service-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.service-card h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

/* ===== 表单 ===== */
.form-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-control {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
}

/* ===== 页脚 ===== */
footer {
    background: #2d3436;
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 0 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section li {
    color: rgba(255,255,255,0.8);
    line-height: 2;
    list-style: none;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* ===== 悬浮客服按钮 ===== */
.float-kefu {
    position: fixed;
    right: 20px;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 9999;
}

.kefu-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.kefu-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.6);
}

/* ===== 移动端适配 ===== */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #667eea;
        padding: 1rem;
    }
    
    nav ul.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .float-kefu {
        right: 10px;
        bottom: 20px;
    }
    
    .kefu-btn {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    /* ===== 移动端视频优化 ===== */
@media (max-width: 768px) {
    /* 视频网格改为单列 */
    .videos-grid {
        grid-template-columns: 1fr !important;
        padding: 1rem !important;
        gap: 1.5rem !important;
    }
    
    /* 视频弹窗调整 */
    #videoModal > div {
        width: 95% !important;
        max-width: 100% !important;
    }
    
    /* 视频标题字体调小 */
    #videoTitle {
        font-size: 0.95rem !important;
        padding: 10px 15px !important;
    }
    
    /* 关闭按钮调小 */
    #videoModal button {
        width: 35px !important;
        height: 35px !important;
        font-size: 1.3rem !important;
        top: 5px !important;
        right: 5px !important;
    }
    
    /* 统计栏改为 2 列 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1rem !important;
    }
    
    .stat-number {
        font-size: 1.8rem !important;
    }
    
    .stat-label {
        font-size: 0.85rem !important;
    }
    
    /* 服务卡片单列 */
    .services-grid {
        grid-template-columns: 1fr !important;
        padding: 1rem !important;
    }
    
    /* 标题字体调小 */
    .section-title {
        font-size: 1.8rem !important;
        margin-bottom: 2rem !important;
    }
    
    /* 导航菜单 */
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #667eea;
        padding: 1rem;
        gap: 0.5rem;
    }
    
    nav ul.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    /* 悬浮客服按钮调小 */
    .float-kefu {
        right: 10px;
        bottom: 15px;
    }
    
    .kefu-btn {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
}

/* ===== 超小屏幕优化 ===== */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem !important;
    }
    
    .hero p {
        font-size: 1rem !important;
    }
    
    .hero-btns {
        flex-direction: column;
        gap: 0.8rem !important;
    }
    
    .hero-btns .btn {
        width: 100%;
        max-width: 280px;
        padding: 0.9rem 1.5rem !important;
        font-size: 1rem !important;
    }
    
    /* 视频卡片调整 */
    .video-card > div:last-child {
        padding: 1rem !important;
    }
    
    .video-card h3 {
        font-size: 1rem !important;
    }
    
    .video-card p {
        font-size: 0.85rem !important;
    }
    
    .video-card .btn {
        padding: 0.6rem 1.2rem !important;
        font-size: 0.9rem !important;
    }
    
    /* 统计栏数字调小 */
    .stat-number {
        font-size: 1.5rem !important;
    }
    
    /* 容器内边距调小 */
    .container {
        padding: 0 1rem !important;
    }
}
}