:root {
    --primary-color: #0056b3;
    --secondary-color: #007bff;
    --accent-color: #00d4ff;
    --text-color: #333;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-color);
}

.navbar {
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    padding: 10px 0;
}

.navbar-brand {
    padding: 0;
}

.navbar-brand img {
    transition: transform 0.3s ease;
}

.navbar-brand img:hover {
    transform: scale(1.05);
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-color) !important;
    padding: 10px 15px !important;
    margin: 0 5px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: rgba(0, 86, 179, 0.05);
}

.nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
    background-color: rgba(0, 86, 179, 0.1);
}

.navbar-toggler {
    border: none;
    outline: none;
}

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

.navbar-collapse {
    justify-content: flex-end;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1IiBoZWlnaHQ9IjUiPgo8cmVjdCB3aWR0aD0iNSIgaGVpZ2h0PSI1IiBmaWxsPSIjZmZmZmZmMDYiPjwvcmVjdD4KPC9zdmc+');
    opacity: 0.1;
}

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

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

.btn-primary:hover {
    background-color: #00b3d4;
    border-color: #00b3d4;
}

.section {
    padding: 80px 0;
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: 40px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--accent-color);
}

.card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.card-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.service-card {
    background-color: var(--light-bg);
    border-radius: 8px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.product-card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 8px;
    overflow: hidden;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.product-image {
    height: 250px;
    object-fit: cover;
}

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

.product-features li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.service-list {
    list-style: none;
    padding: 0;
}

.service-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
}

.service-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.2em;
}

.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background-color: var(--light-bg);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.timeline-item:nth-child(odd) {
    padding-right: calc(50% + 30px);
    text-align: right;
}

.timeline-item:nth-child(even) {
    padding-left: calc(50% + 30px);
}

.timeline-dot {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--accent-color);
    border: 4px solid white;
    box-shadow: 0 0 0 2px var(--accent-color);
}

.value-card {
    background-color: var(--light-bg);
    border-radius: 8px;
    padding: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.value-icon {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.team-card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 8px;
    overflow: hidden;
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.team-image {
    height: 200px;
    object-fit: cover;
}

.partner-logo {
    max-height: 80px;
    filter: grayscale(100%);
    transition: filter 0.3s ease, transform 0.3s ease;
}

.partner-logo:hover {
    filter: grayscale(0%);
    transform: scale(1.05);
}

.contact-info {
    background-color: var(--light-bg);
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-right: 15px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.map-container {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ced4da;
    padding: 12px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 212, 255, 0.25);
}

.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 60px 0 30px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}

.footer-links a:hover {
    color: white;
}

.copyright {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    margin-top: 30px;
}

/* 滚动到顶部按钮 */
.btn-primary.fixed-bottom {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-primary.fixed-bottom:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-section {
        padding: 60px 0;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px !important;
        padding-right: 0 !important;
        text-align: left !important;
    }
    
    .timeline-dot {
        left: 20px;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .contact-icon {
        margin-bottom: 10px;
    }
    
    .btn-primary.fixed-bottom {
        width: 45px;
        height: 45px;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 40px 0;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .card-icon {
        font-size: 2rem;
    }
    
    .value-icon {
        font-size: 2rem;
    }
    
    .btn-primary.fixed-bottom {
        width: 40px;
        height: 40px;
        font-size: 0.8rem;
    }
}