/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #e2e8f0;
    background-color: #0f172a;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #60a5fa;
}

.nav-logo i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

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

.nav-menu a {
    text-decoration: none;
    color: #e2e8f0;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #60a5fa;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: #e2e8f0;
    margin: 3px 0;
    transition: 0.3s;
}

/* 语言切换器 */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #60a5fa;
    background: transparent;
    color: #60a5fa;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: #60a5fa;
    color: #0f172a;
}

.lang-btn.active {
    background: #60a5fa;
    color: #0f172a;
}

/* 主页部分 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

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

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #3b82f6;
    color: white;
}

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

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

.btn-secondary:hover {
    background: white;
    color: #1e293b;
}

.btn-large {
    padding: 1.5rem 3rem;
    font-size: 1.1rem;
}

/* 视频展示区域 */
.hero-image {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
}

/* 特性部分 */
.features {
    padding: 6rem 0;
    background: #1e293b;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #f1f5f9;
}

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

.feature-card {
    background: #334155;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
    border: 1px solid rgba(51, 65, 85, 0.5);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.feature-card p {
    color: #cbd5e1;
    line-height: 1.6;
}

/* 技术亮点 */
.tech-highlights {
    padding: 6rem 0;
    background: #0f172a;
}

.tech-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.tech-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: #f1f5f9;
}

.highlight-item {
    margin-bottom: 2rem;
}

.highlight-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #60a5fa;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.highlight-item p {
    color: #cbd5e1;
    line-height: 1.6;
}

.tech-visual {
    position: relative;
    height: 400px;
}

.floating-elements {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-box, .floating-sphere {
    position: absolute;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    animation: float 4s ease-in-out infinite;
}

.floating-box {
    width: 60px;
    height: 60px;
    border-radius: 10px;
    top: 20%;
    left: 30%;
    animation-delay: 0s;
}

.floating-sphere {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    top: 40%;
    right: 20%;
    animation-delay: 2s;
}

.water-surface {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(to top, rgba(59, 130, 246, 0.3), transparent);
    border-radius: 50px 50px 0 0;
}

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

/* 演示部分 */
.demo {
    padding: 6rem 0;
    background: #1e293b;
}

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

.demo-card {
    background: #334155;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
    border: 1px solid rgba(51, 65, 85, 0.5);
}

.demo-card:hover {
    transform: translateY(-5px);
}

.demo-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #10b981, #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.demo-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.demo-card p {
    color: #cbd5e1;
    line-height: 1.6;
}

/* 下载部分 */
.download {
    padding: 6rem 0;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    text-align: center;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 联系部分 */
.contact {
    padding: 6rem 0;
    background: #0f172a;
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: #334155;
    border-radius: 15px;
    text-align: center;
    flex-direction: column;
    border: 1px solid rgba(51, 65, 85, 0.5);
}

.contact-item i {
    font-size: 2rem;
    color: #60a5fa;
}

.contact-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #f1f5f9;
}

.contact-item p {
    color: #cbd5e1;
    word-break: break-all;
}

.contact-item p a {
    color: #60a5fa;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item p a:hover {
    color: #93c5fd;
}

/* 页脚 */
.footer {
    background: #0f172a;
    color: white;
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid rgba(51, 65, 85, 0.3);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #60a5fa;
}

.footer-logo i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

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

    .language-switcher {
        margin-left: 0;
        gap: 0.3rem;
    }

    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .tech-content {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }
}