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

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

:root {
    --primary-blue: #1a56db;
    --secondary-blue: #3b82f6;
    --dark-blue: #1e3a5f;
    --light-blue: #60a5fa;
    --white: #ffffff;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
}

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

header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 50px;
    height: 50px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-links .active {
    color: var(--light-blue);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

.hero {
    margin-top: 80px;
    background: url('../images/background1.png') no-repeat center center;
    background-size: cover;
    padding: 6rem 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 30, 80, 0.3);
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h2 {
    font-size: 3rem;
    color: #ffffff;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero .btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(26, 86, 219, 0.4);
}

.features {
    padding: 4rem 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--dark-blue);
    margin-bottom: 3rem;
}

.about .section-title {
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(26, 86, 219, 0.1);
}

.feature-card .icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    border-radius: 15px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    color: var(--dark-blue);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--gray);
    font-size: 0.95rem;
}

.about {
    padding: 4rem 0;
    background: url('../images/background2.png') no-repeat center center;
    background-size: cover;
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 30, 80, 0.3);
}

.about .container {
    position: relative;
    z-index: 1;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

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

.logo-display img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.about-content h3 {
    font-size: 2rem;
    color: #ffffff;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.about-content p {
    color: rgba(255,255,255,0.9);
    margin-bottom: 1rem;
    line-height: 1.8;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.products {
    padding: 4rem 0;
    background: white;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.product-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(26, 86, 219, 0.15);
}

.product-card .product-icon {
    width: 100%;
    height: 150px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 4rem;
}

.product-card .product-info {
    padding: 1.5rem;
}

.product-card h3 {
    color: var(--dark-blue);
    margin-bottom: 0.5rem;
}

.product-card p {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.product-card .price {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 1.2rem;
}

.news {
    padding: 4rem 0;
    background: var(--light-gray);
}

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

.news-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.news-card:hover {
    transform: translateY(-3px);
}

.news-card .news-icon {
    width: 100%;
    height: 120px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 3rem;
}

.news-card .news-info {
    padding: 1.5rem;
}

.news-card .date {
    color: var(--light-blue);
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.news-card h3 {
    color: var(--dark-blue);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.news-card p {
    color: var(--gray);
    font-size: 0.9rem;
}

.careers {
    padding: 4rem 0;
    background: white;
}

.careers-list {
    max-width: 800px;
    margin: 0 auto;
}

.career-item {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.career-item:hover {
    transform: translateX(10px);
}

.career-item .career-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.career-item h3 {
    color: var(--dark-blue);
    font-size: 1.2rem;
}

.career-item .tag {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.career-item p {
    color: var(--gray);
    font-size: 0.95rem;
}

.contact {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.contact-info .contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info .contact-item i {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 15px;
}

.contact-form h4 {
    color: var(--dark-blue);
    margin-bottom: 1.5rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: inherit;
}

.contact-form textarea {
    height: 120px;
    resize: none;
}

.contact-form button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.contact-form button:hover {
    transform: translateY(-2px);
}

footer {
    background: var(--dark-blue);
    color: white;
    padding: 3rem 0;
}

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

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--light-blue);
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #9ca3af;
    font-size: 0.9rem;
}

.page-header {
    margin-top: 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 3rem 0;
    text-align: center;
}

.page-header h2 {
    font-size: 2.5rem;
    color: var(--dark-blue);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--primary-blue);
        flex-direction: column;
        padding: 1rem;
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

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

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .products-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
}