/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007aff;
    --secondary-color: #34c759;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f5f5f5;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 顶部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
    width: auto;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-item {
    text-decoration: none;
    color: var(--text-color);
    font-size: 16px;
    transition: color 0.3s;
    position: relative;
}

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

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: all 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 999;
    padding: 20px;
    flex-direction: column;
    gap: 15px;
}

.mobile-menu.active {
    display: flex;
}

.mobile-nav-item {
    text-decoration: none;
    color: var(--text-color);
    font-size: 16px;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
}

/* 首页轮播 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 20px 50px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.9;
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    color: var(--white);
    max-width: 800px;
}

.hero-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1.2s;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
    cursor: pointer;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

/* 服务项目 */
.services {
    padding: 100px 0;
    background: var(--white);
}

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

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 18px;
    margin-bottom: 60px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.service-icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.service-title {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.service-desc {
    color: var(--text-light);
    line-height: 1.8;
}

/* 优势特点 */
.features {
    padding: 100px 0;
    background: var(--bg-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.feature-item {
    text-align: center;
    padding: 30px;
}

.feature-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: var(--white);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text p {
    font-size: 16px;
    line-height: 2;
    color: var(--text-light);
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 50px;
    padding-top: 50px;
    border-top: 2px solid var(--border-color);
}

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

.stat-number {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-light);
    font-size: 16px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: var(--bg-color);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.contact-item {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.contact-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.contact-item p {
    color: var(--text-light);
    margin-bottom: 10px;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

.contact-time {
    font-size: 14px;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 10px;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: var(--white);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

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

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

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 28px;
    }

    .services-grid,
    .features-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选中文本样式 */
::selection {
    background: var(--primary-color);
    color: var(--white);
}