/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-text: #6b7280;
    --background: #ffffff;
    --light-background: #f3f4f6;
    --border-color: #e5e7eb;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 导航栏样式更新 */
header {
    background: var(--background);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    background: linear-gradient(45deg, #4F46E5, #2563EB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1.1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

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

nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

nav a:hover::after, nav a.active::after {
    width: 100%;
}

/* 移动端菜单按钮样式 */
.menu-button {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    z-index: 1001;
    width: 40px;
    height: 40px;
}

.menu-button .menu-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    position: relative;
    transition: all 0.3s ease;
}

.menu-button .menu-icon::before,
.menu-button .menu-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    transition: all 0.3s ease;
}

.menu-button .menu-icon::before {
    top: -8px;
}

.menu-button .menu-icon::after {
    bottom: -8px;
}

.menu-button.active .menu-icon {
    background: transparent;
}

.menu-button.active .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-button.active .menu-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* 蒙层样式 */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 998;
}

.overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 768px) {
    .menu-button {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    nav {
        position: fixed;
        top: 0;
        right: 0;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: white;
        padding: 100px 2rem 2rem;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 999;
        box-shadow: -2px 0 10px rgba(0,0,0,0.1);
    }

    nav.active {
        transform: translateX(0);
    }

    nav ul {
        flex-direction: column;
        gap: 1.5rem;
    }

    nav a {
        display: block;
        font-size: 1.2rem;
        padding: 0.75rem 0;
    }

    nav a::after {
        display: none;
    }

    nav a:hover, nav a.active {
        color: var(--primary-color);
        padding-left: 1rem;
    }

    /* 暗色模式支持 */
    @media (prefers-color-scheme: dark) {
        nav {
            background: white;
        }
        
        nav a {
            color: var(--text-color);
        }
    }
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

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

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

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

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

/* 英雄区样式 */
.hero {
    padding: 160px 0 80px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f2ff 100%);
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--light-text);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 产品卡片样式 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.products {
    padding: 80px 0;
    background: var(--background);
}

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

.product-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

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

.product-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-color);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

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

.product-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.product-features {
    list-style: none;
    margin: 1.5rem 0;
}

.product-features li {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.product-features i {
    color: var(--primary-color);
}

.product-cta {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* 特性区域样式 */
.features {
    padding: 80px 0;
    background: var(--light-background);
}

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

.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.feature-card h3 {
    margin-bottom: 1rem;
}

/* CTA区域样式 */
.cta {
    padding: 80px 0;
    background: var(--primary-color);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.cta .btn-large:hover {
    background: var(--light-background);
}

/* 页脚样式 */
footer {
    background: var(--light-background);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    margin-bottom: 1.5rem;
}

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

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    text-decoration: none;
    color: var(--light-text);
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
}

.copyright {
    text-align: center;
    color: var(--light-text);
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .product-grid, .features-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .product-cta {
        flex-direction: column;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}