:root {
    --primary-color: #0066cc;
    --primary-dark: #0052a3;
    --secondary-color: #666;
    --dark-color: #333;
    --light-color: #f8f9fa;
    --border-color: #e0e0e0;
    --transition: all 0.3s ease;
}


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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}
.navbar-brand {
  display: flex;
  flex-direction: row;
  align-items: center;
}
.navbar-brand img {
    height: 30px;
    margin-right: 0.5rem;
}
.navbar-brand span {

      font-size: var(--bs-nav-link-font-size);
    font-weight: var(--bs-nav-link-font-weight);
    color: var(--bs-nav-link-color);
}


.nav-link {
    color: var(--dark-color) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color) !important;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* 页脚 */
.footer {
    background: var(--dark-color);
    color: #fff;
    padding: 80px 0 40px;
}

.footer h5,
.footer h6 {
    color: #fff;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: #fff;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.25rem;
}

.social-link:hover {
    background: var(--primary-color);
    color: #fff;
    transform: translateY(-3px);
}

.footer-links {
    margin: 0;
    padding: 0;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.contact-info {
    margin: 0;
    padding: 0;
}

.contact-info li {
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
}
.contact-info li img{
    width: 1.2rem;
    margin-right: 0.5rem;
}
.contact-info i {
    color: var(--primary-color);
}

.footer hr {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.footer .text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

/* 响应式调整 */
@media (max-width: 991px) {
    .navbar-collapse {
        background: #fff;
        padding: 1rem;
        border-radius: 10px;
        margin-top: 1rem;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    }

    .hero-section {
        padding: 100px 0 60px;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .product-tab {
        margin-bottom: 1rem;
    }
}

@media (max-width: 767px) {
    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section .lead {
        font-size: 1rem;
    }

    #about,
    #products,
    #services {
        padding: 60px 0;
    }

    .product-card,
    .industry-card,
    .advantage-card {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .footer {
        padding: 60px 0 30px;
    }

    .footer .col-lg-4,
    .footer .col-lg-2 {
        margin-bottom: 2rem;
    }
}

@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 1.75rem;
    }

    .product-tabs {
        flex-direction: column;
        align-items: center;
    }

    .product-tab {
        width: 100%;
        max-width: 300px;
    }
}