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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: #007bff;
    margin: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: #007bff;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #007bff;
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* 首页横幅 */
.hero {
    position: relative;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><path d="M10 10L90 10L90 90L10 90Z" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/><path d="M20 20L80 20L80 80L20 80Z" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/><path d="M30 30L70 30L70 70L30 70Z" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/><path d="M40 40L60 40L60 60L40 60Z" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></svg>');
    z-index: -1;
}

.hero-content {
    z-index: 1;
    color: white;
    max-width: 800px;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

/* 通用 section 样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 20px;
}

.line {
    width: 80px;
    height: 3px;
    background: #007bff;
    margin: 0 auto;
    border-radius: 2px;
}

/* 关于我们 */
.about {
    background: linear-gradient(rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.8)), url('http://nsl.nnruanyun.com/ruanyun/back.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: #007bff;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 业务范围 */
.services {
    background: linear-gradient(rgba(245, 247, 250, 0.8), rgba(245, 247, 250, 0.8)), url('http://nsl.nnruanyun.com/ruanyun/back.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
}

.service-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 15px;
}

.service-card p {
    color: #666;
    line-height: 1.7;
}

/* 成功案例 */
.cases {
    background: white;
}

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

.case-card {
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.case-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.case-link {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    background: #007bff;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.case-link:hover {
    background: #0056b3;
    transform: scale(1.05);
}

.case-info {
    padding: 25px;
}

.case-info h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 10px;
}

.case-info p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

/* 联系我们 */
.contact {
    background: linear-gradient(rgba(245, 247, 250, 0.8), rgba(245, 247, 250, 0.8)), url('http://nsl.nnruanyun.com/ruanyun/back.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-item svg {
    width: 24px;
    height: 24px;
    color: #007bff;
    margin-top: 5px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 5px;
}

.contact-item p {
    color: #666;
    font-size: 14px;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    background: #007bff;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-form button:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 30px;
}

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

.footer-info h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #007bff;
}

.footer-info p {
    color: #bdc3c7;
    line-height: 1.7;
}

.footer-links h4,
.footer-social h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ecf0f1;
}

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

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

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #007bff;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #bdc3c7;
    transition: all 0.3s ease;
}

.social-icons a:hover {
    background: #007bff;
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #bdc3c7;
    font-size: 14px;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.footer-bottom a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom a:hover {
    color: #3498db;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: white;
        width: 100%;
        padding: 30px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
    }

    .nav-links.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hero-content h2 {
        font-size: 36px;
    }

    .hero-content p {
        font-size: 18px;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .stat-number {
        font-size: 36px;
    }

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

    .contact-form {
        padding: 30px;
    }

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

    .social-icons {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 28px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 28px;
    }

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

    .contact-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}