:root {
    --primary-color: #2196f3;
    --primary-dark: #1976d2;
    --primary-light: #64b5f6;
    --accent-color: #00bcd4;
    --text-color: #2c3e50;
    --background-color: #f8f9fa;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #2196f3, #00bcd4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Arial', sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.header {
    background-color: var(--white);
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: var(--accent-color);
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 2rem;
    transition: all 0.3s;
    font-weight: 500;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.3s;
}

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

.hero {
    text-align: center;
    padding: 8rem 2rem 4rem;
    background: var(--gradient);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1551288042-0c5a0b1b0b8a?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80') center/cover;
    opacity: 0.1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
}

.hero p {
    font-size: 1.4rem;
    margin-bottom: 2rem;
    position: relative;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.features {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s;
    position: relative;
    overflow: hidden;
}

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

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-card p {
    color: #666;
}

.footer {
    background-color: var(--primary-dark);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

.footer-links a:hover {
    color: var(--accent-color);
}

.social-links {
    margin-top: 1.5rem;
}

.social-links a {
    color: var(--white);
    margin: 0 1rem;
    font-size: 1.5rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--accent-color);
}

.pricing {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.pricing h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.pricing p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
}

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

.pricing-card {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
    position: relative;
    overflow: hidden;
}

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

.pricing-card.popular {
    border: 2px solid var(--primary-color);
}

.pricing-card.popular::before {
    content: '最受欢迎';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--gradient);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    border-bottom-left-radius: 15px;
}

.pricing-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.price {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.price span {
    font-size: 1rem;
    color: #666;
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
}

.pricing-features li {
    margin-bottom: 1rem;
    color: #666;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.pricing-button {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: all 0.3s;
    width: 100%;
    text-align: center;
}

.pricing-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.about {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.about p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

.about-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.about-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.about-card p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 0;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
    padding: 2rem;
    background: var(--gradient);
    border-radius: 15px;
    color: white;
}

.stat-item h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.stat-item p {
    font-size: 1.1rem;
    margin: 0;
    color: white;
}

.use-cases {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.use-cases h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.use-cases p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

.use-case-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
    text-align: left;
    position: relative;
    overflow: hidden;
}

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

.use-case-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.use-case-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.use-case-card p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 1.5rem;
    text-align: left;
}

.use-case-card .solution {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 1rem;
}

.use-case-card .solution h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.use-case-card .solution p {
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.solution-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.solution-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #666;
}

.solution-features li i {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }

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

    .nav-links a {
        margin: 0;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

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

    .pricing h2 {
        font-size: 2rem;
    }

    .about h2 {
        font-size: 2rem;
    }

    .use-cases h2 {
        font-size: 2rem;
    }
}