/* CSS重置和基本设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #2563eb;
    font-size: 1.8rem;
    font-weight: 700;
}

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

.nav-menu a {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-menu a:hover {
    color: #2563eb;
    background: #f3f4f6;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #374151;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主页横幅样式 */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.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="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #e5e7eb;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.1rem;
    color: #d1d5db;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: #3b82f6;
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

/* AI动画效果 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.ai-animation {
    position: relative;
    width: 300px;
    height: 300px;
}

.node {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #60a5fa;
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(96, 165, 250, 0.6);
    animation: pulse 2s ease-in-out infinite;
}

.node:nth-child(1) {
    top: 50px;
    left: 50px;
    animation-delay: 0s;
}

.node:nth-child(2) {
    top: 50px;
    right: 50px;
    animation-delay: 0.7s;
}

.node:nth-child(3) {
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 1.4s;
}

.connection {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, transparent, #60a5fa, transparent);
    animation: flow 3s ease-in-out infinite;
}

.connection:nth-child(4) {
    top: 60px;
    left: 70px;
    right: 70px;
}

.connection:nth-child(5) {
    top: 60px;
    left: 150px;
    width: 2px;
    height: 200px;
    background: linear-gradient(180deg, transparent, #60a5fa, transparent);
    transform: rotate(60deg);
    transform-origin: top;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

@keyframes flow {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* 通用部分样式 */
section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.8rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-header p {
    font-size: 1.2rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们样式 */
.about {
    background: #f9fafb;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 2rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 600;
}

.about-text p {
    font-size: 1.1rem;
    color: #4b5563;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.advantages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.advantage-item {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: all 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.advantage-item i {
    font-size: 3rem;
    color: #3b82f6;
    margin-bottom: 1rem;
}

.advantage-item h4 {
    font-size: 1.3rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 600;
}

.advantage-item p {
    color: #6b7280;
    line-height: 1.6;
}

/* 核心业务样式 */
.services {
    background: white;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.service-card {
    background: linear-gradient(145deg, #f8fafc, #e2e8f0);
    padding: 2.5rem;
    border-radius: 20px;
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: #3b82f6;
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 600;
}

.service-card p {
    color: #4b5563;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.service-features {
    list-style: none;
}

.service-features li {
    color: #6b7280;
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* 行业解决方案样式 */
.solutions {
    background: #f9fafb;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.solution-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.solution-header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    padding: 2rem;
    text-align: center;
    color: white;
}

.solution-header i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.solution-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

.solution-content {
    padding: 2rem;
}

.solution-content h4 {
    font-size: 1.3rem;
    color: #1f2937;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.solution-content ul {
    list-style: none;
}

.solution-content li {
    color: #4b5563;
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
}

.solution-content li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: bold;
}

/* 技术特色样式 */
.tech-features {
    background: white;
}

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

.tech-item {
    text-align: center;
    padding: 2rem;
    border-radius: 16px;
    transition: all 0.3s ease;
}

.tech-item:hover {
    background: #f8fafc;
    transform: translateY(-4px);
}

.tech-item i {
    font-size: 3rem;
    color: #3b82f6;
    margin-bottom: 1rem;
}

.tech-item h4 {
    font-size: 1.3rem;
    color: #1f2937;
    margin-bottom: 1rem;
    font-weight: 600;
}

.tech-item p {
    color: #6b7280;
    line-height: 1.6;
}

/* 联系我们样式 */
.contact {
    background: #f9fafb;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.contact-item i {
    font-size: 1.5rem;
    color: #3b82f6;
    width: 40px;
    text-align: center;
}

.contact-item h4 {
    color: #1f2937;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.contact-item p {
    color: #6b7280;
}

.contact-form {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.contact-form h3 {
    font-size: 1.5rem;
    color: #1f2937;
    margin-bottom: 2rem;
    font-weight: 600;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
}

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

/* 页脚样式 */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #f3f4f6;
}

.footer-section p,
.footer-section li {
    color: #d1d5db;
    line-height: 1.6;
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

.beian-info {
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.beian-info a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.beian-info a:hover {
    color: #d1d5db;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

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

    .nav-toggle {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-visual {
        order: -1;
    }

    .ai-animation {
        width: 200px;
        height: 200px;
    }

    .section-header h2 {
        font-size: 2.2rem;
    }

    .advantages {
        grid-template-columns: 1fr;
    }

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

    .solutions-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .service-card,
    .contact-form {
        padding: 1.5rem;
    }
}

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

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #3b82f6;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2563eb;
}