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

/* 根变量定义 */
:root {
    --primary-color: #00d4ff;
    --secondary-color: #0066cc;
    --accent-color: #ff6b35;
    --dark-bg: #0a0a0a;
    --dark-secondary: #1a1a1a;
    --light-bg: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-dark: #333333;
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0066cc 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
    --shadow-light: 0 4px 20px rgba(0, 212, 255, 0.1);
    --shadow-dark: 0 8px 40px rgba(0, 0, 0, 0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
    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(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

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

.nav-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.logo-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

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

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

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* 首页横幅样式 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--gradient-dark);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.tech-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.hero-content {
    text-align: center;
    z-index: 2;
    position: relative;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    margin-bottom: 30px;
}

.title-main {
    display: block;
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    display: block;
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-secondary);
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 2px;
    height: 30px;
    background: var(--primary-color);
    position: relative;
    animation: scrollBounce 2s infinite;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    transform: rotate(45deg);
}

@keyframes scrollBounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* 通用区块样式 */
.section {
    padding: 100px 0;
    position: relative;
}

.section-dark {
    background: var(--gradient-dark);
    color: var(--text-primary);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-dark .section-title {
    color: var(--text-primary);
    background: none;
    -webkit-text-fill-color: unset;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #888888 !important;
    font-weight: 300;
}

/* 关于我们样式 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: rgba(0, 212, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(0, 212, 255, 0.1);
    transition: var(--transition);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    background: var(--gradient-dark);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
}

.tech-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 102, 204, 0.3) 0%, transparent 50%);
    animation: patternFloat 6s ease-in-out infinite;
}

@keyframes patternFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 产品方案样式 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.product-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-dark);
    border-color: var(--primary-color);
}

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.icon-cockpit::before {
    content: '🤖';
    font-size: 2rem;
}

.icon-driving::before {
    content: '💬';
    font-size: 2rem;
}

.icon-access::before {
    content: '📊';
    font-size: 2rem;
}

.icon-software::before {
    content: '⚡';
    font-size: 2rem;
}

.icon-vision::before {
    content: '👁️';
    font-size: 2rem;
}

.icon-automation::before {
    content: '🔄';
    font-size: 2rem;
}

.product-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.product-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 技术实力样式 */
.tech-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 80px;
    align-items: start;
}

.tech-achievements {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.achievement-item {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(0, 212, 255, 0.1);
    transition: var(--transition);
}

.achievement-item:hover {
    transform: translateX(10px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.2);
}

.achievement-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 50%;
    border: 2px solid rgba(0, 212, 255, 0.2);
}

.achievement-text h4 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #00d4ff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

.achievement-text p {
    color: #888888;
    line-height: 1.7;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    font-size: 1.05rem;
}

.tech-certifications {
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--border-radius);
    padding: 40px;
    border: 2px solid rgba(0, 212, 255, 0.2);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.1);
}

.tech-certifications h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: #00d4ff;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
    letter-spacing: 1px;
}

.cert-grid {
    display: grid;
    gap: 20px;
}

.cert-item {
    padding: 25px 20px;
    background: #ffffff;
    border-radius: 12px;
    text-align: center;
    font-weight: 500;
    color: #2c2c2c;
    transition: var(--transition);
    border: 3px solid rgba(0, 212, 255, 0.6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 120px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.cert-item:hover {
    background: #f8f9ff;
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
    color: #2c2c2c;
}

.cert-icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.cert-text {
    font-size: 1.3rem;
    font-weight: 800;
    color: #888888;
    text-shadow: none;
    letter-spacing: 0.8px;
    line-height: 1.2;
}

/* 合作伙伴样式 */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.partner-item {
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.partner-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-light);
}

/* 联系我们样式 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

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

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.contact-details p {
    color: var(--text-dark);
    line-height: 1.6;
}

.contact-form {
    background: rgba(0, 212, 255, 0.05);
    border-radius: var(--border-radius);
    padding: 40px;
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.form-group {
    margin-bottom: 25px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

/* 页脚样式 */
.footer {
    background: var(--dark-bg);
    color: var(--text-primary);
    padding: 40px 0;
    border-top: 1px solid rgba(0, 212, 255, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-info {
    text-align: right;
}

.footer-info p {
    color: var(--text-secondary);
    margin-bottom: 5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--dark-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 15px 0;
    }
    
    .title-main {
        font-size: 2.5rem;
    }
    
    .title-sub {
        font-size: 1.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .about-content,
    .tech-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .tech-content {
        gap: 30px;
    }
    
    .cert-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .cert-item {
        min-height: 100px;
        padding: 20px 15px;
        background: #ffffff;
        color: #2c2c2c;
        border: 3px solid rgba(0, 212, 255, 0.6);
    }
    
    .cert-icon {
        font-size: 2rem;
    }
    
    .cert-text {
        font-size: 1.2rem;
        font-weight: 800;
        color: #2c2c2c;
        letter-spacing: 0.5px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .title-main {
        font-size: 2rem;
    }
    
    .title-sub {
        font-size: 1.2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    .achievement-item {
        flex-direction: column;
        text-align: center;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

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

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

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 100px;
    right: 15px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
    background: var(--secondary-color);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top-icon {
    font-size: 24px;
    font-weight: bold;
    line-height: 1;
    transition: transform 0.3s ease;
}

.back-to-top:hover .back-to-top-icon {
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .back-to-top-icon {
        font-size: 20px;
    }
}