/* ===== 头部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: white;
    box-shadow: var(--shadow);
    z-index: 1000;
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo span {
    color: var(--text-dark);
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav a {
    color: var(--text-dark);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 0;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: var(--primary-color);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 页脚 ===== */
.footer {
    background: #1a1a1a;
    color: #ccc;
    padding: 60px 0 20px;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: white;
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    color: #ccc;
    font-size: 14px;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-contact p {
    margin-bottom: 10px;
    color: #999;
    font-size: 14px;
}

.footer-contact i {
    color: var(--primary-color);
    margin-right: 8px;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
    color: #666;
}

.footer-bottom .icp-info {
    margin-top: 10px;
    font-size: 12px;
    color: #888;
}

.footer-bottom .icp-info a,
.footer-bottom .icp-info span {
    color: #888;
    text-decoration: none;
}

.footer-bottom .icp-info a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* ===== 首页 Hero 区域 ===== */
.hero {
    margin-top: var(--header-height);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--dark-red) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

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

.hero .btn-white:hover {
    background: #f5f5f5;
}

/* ===== 业务卡片 ===== */
.services-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--text-gray);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.service-card {
    background: white;
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
    height: 100%;
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--light-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 36px;
    color: var(--primary-color);
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

/* ===== 数据统计 ===== */
.stats-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--dark-red) 100%);
    color: white;
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ===== 响应式调整 ===== */
@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: transform 0.3s;
        z-index: 999;
    }
    
    .nav.active {
        transform: translateY(0);
    }
    
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .footer-top {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .footer-top {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .stat-number {
        font-size: 36px;
    }
}