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

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
}

.navbar {
    background-color: #fff;
    padding: 1rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2c3e50;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #3498db;
}

.hero {
    position: relative;
    height: 100vh;
    overflow: hidden;
}

.slider {
    width: 100%;
    height: 100%;
    position: relative;
}

.slides {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.slide.active {
    opacity: 1;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.slide-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.slide-content p {
    font-size: 1.5rem;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    color: white;
    padding: 1rem 1.5rem;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    z-index: 2;
    transition: background 0.3s;
}

.slider-btn:hover {
    background: rgba(0, 0, 0, 0.8);
}

.prev {
    left: 20px;
}

.next {
    right: 20px;
}

.section {
    padding: 4rem 5%;
}

.section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin: 3rem auto;
    max-width: 1400px;
    padding: 0 2rem;
}

.advantage-card {
    background: #fff;
    padding: 2.5rem 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(52, 152, 219, 0.1);
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(52, 152, 219, 0.15);
}

.advantage-card:hover::before {
    opacity: 1;
}

.advantage-card h3 {
    color: #2c3e50;
    margin-bottom: 1.2rem;
    font-size: 1.4rem;
    position: relative;
    padding-bottom: 1rem;
}

.advantage-card h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: #3498db;
}

.advantage-card p {
    color: #666;
    line-height: 1.8;
    font-size: 1.05rem;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info p {
    margin-bottom: 1rem;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

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

    .nav-links {
        margin-top: 1rem;
    }

    .nav-links li {
        margin: 0 1rem;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .section {
        padding: 3rem 1rem;
    }
}

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

.about-details ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 0;
}

.about-details li {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    padding-left: 2rem;
}

.about-details li:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.about-details li:before {
    content: "•";
    color: #3498db;
    font-weight: bold;
    font-size: 1.5rem;
    position: absolute;
    left: 0.8rem;
    top: 1.3rem;
}

.mission {
    text-align: center;
    font-weight: 500;
    color: #2c3e50;
    margin-top: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 10px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

#about > p:first-of-type {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
    color: #495057;
}

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

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.intro-text {
    max-width: 1000px;
    margin: 0 auto;
}

.highlight-text {
    font-size: 1.2rem;
    color: #2c3e50;
    line-height: 1.8;
    margin-bottom: 2rem;
    text-align: justify;
    font-weight: 500;
}

.company-features {
    display: grid;
    gap: 2rem;
}

.company-features p {
    color: #555;
    line-height: 1.8;
    text-align: justify;
}

.business-section {
    background: #f8f9fa;
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.business-title {
    text-align: center;
    color: #2c3e50;
    font-size: 1.8rem;
    margin-bottom: 2.5rem;
    position: relative;
}

.business-item-title {
    color: #3498db;
    font-weight: 600;
    font-size: 1.1rem;
    display: block;
    margin-bottom: 0.5rem;
}

.about-details ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.about-details li {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

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

.mission-section {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
}

.mission {
    font-size: 1.1rem;
    color: #2c3e50;
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .about-details ul {
        grid-template-columns: 1fr;
    }
    
    .business-section {
        padding: 2rem 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}