:root {
    --primary-dark-blue: #0B2447;
    --secondary-dark-blue: #19376D;
    --accent-blue: #576CBC;
    --light-blue: #A5D7E8;
    --light-blue-gray: #E5EBF1;
    --medium-gray: #8896A6;
    --dark-gray: #4A5568;
    --gold: #D4AF37;
    --light-gold: #F0E68C;
    --deep-red: #7D1A1D;
}

body {
    font-family: 'Open Sans', sans-serif;
    color: var(--dark-gray);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
}

.navbar {
    background: linear-gradient(to right, var(--primary-dark-blue), var(--secondary-dark-blue));
    padding: 15px 0;
}

.navbar-brand {
    font-weight: 700;
    color: white !important;
    display: flex;
    align-items: center;
}

.navbar-brand img {
    height: 30px;
    margin-right: 8px;
}

.nav-link {
    color: white !important;
    font-weight: 500;
    margin: 0 10px;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--light-gold) !important;
}

/* 修改：为活动链接添加黄色下划线 */
.nav-link.active {
    color: var(--gold) !important;
    position: relative;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--gold);
    transform: scaleX(1);
    transition: transform 0.3s ease;
}

.nav-link-highlighted {
    color: var(--gold) !important;
    position: relative;
}

.nav-link-highlighted::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--gold);
    transform: scaleX(1);
    transition: transform 0.3s ease;
}

.nav-link-hover {
    color: var(--gold) !important;
}

.nav-link-hover::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--gold);
    transform: scaleX(0);
    transform-origin: center;
    animation: navHighlight 0.3s forwards;
}

@keyframes navHighlight {
    0% {
        transform: scaleX(0);
    }

    100% {
        transform: scaleX(1);
    }
}

.btn-primary {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: var(--secondary-dark-blue);
    border-color: var(--secondary-dark-blue);
}

.btn-outline-primary {
    border-color: var(--gold);
    color: var(--gold);
    font-weight: 500;
}

.btn-outline-primary:hover {
    background-color: var(--gold);
    color: white;
}

.hero-section {
    background: linear-gradient(rgba(11, 36, 71, 0.8), rgba(25, 55, 109, 0.9)), url('../images/tech-bg.jpeg') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/circuit-pattern.png');
    opacity: 0.1;
    z-index: 1;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: var(--light-blue-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 36px;
    color: var(--primary-dark-blue);
}

.feature-card {
    padding: 30px;
    border-radius: 6px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    height: 100%;
    transition: transform 0.3s ease;
}

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

.tech-highlight {
    background-color: var(--light-blue-gray);
    padding: 80px 0;
}

.tech-img {
    border-radius: 6px;
    overflow: hidden;
}

.tech-content h3 {
    color: var(--primary-dark-blue);
    margin-bottom: 20px;
}

.cta-section {
    background: linear-gradient(to right, var(--primary-dark-blue), var(--secondary-dark-blue));
    color: white;
    padding: 60px 0;
}

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

footer h5 {
    color: var(--gold);
    margin-bottom: 20px;
}

footer ul {
    list-style: none;
    padding-left: 0;
}

footer ul li {
    margin-bottom: 10px;
}

footer ul li a {
    color: white;
    text-decoration: none;
}

footer ul li a:hover {
    color: var(--light-gold);
    text-decoration: underline;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    margin-top: 40px;
}

.tech-specs-table {
    width: 100%;
    border-collapse: collapse;
}

.tech-specs-table th {
    background-color: var(--primary-dark-blue);
    color: white;
    padding: 12px 15px;
    text-align: left;
}

.tech-specs-table tr:nth-child(odd) {
    background-color: var(--light-blue-gray);
}

.tech-specs-table td {
    padding: 12px 15px;
}

.tech-specs-table tr:hover {
    background-color: var(--light-gold);
}

.language-switch {
    display: flex;
    align-items: center;
    margin-left: 15px;
}

.language-switch a {
    color: white;
    text-decoration: none;
    padding: 5px 8px;
    font-weight: 500;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.language-switch a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.language-switch a.active {
    background-color: var(--gold);
    color: white;
}

.language-switch .divider {
    color: rgba(255, 255, 255, 0.5);
    margin: 0 5px;
}

.page-header {
    background: linear-gradient(to right, var(--primary-dark-blue), var(--secondary-dark-blue));
    color: white;
    padding: 60px 0;
    margin-top: 80px;
}

.product-img-thumbnail {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border: 2px solid transparent;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.product-img-thumbnail:hover,
.product-img-thumbnail.active {
    border-color: var(--gold);
}

.feature-list li {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
}

.feature-list i {
    color: var(--gold);
    margin-right: 10px;
    margin-top: 5px;
}

.nav-tabs .nav-link {
    color: var(--dark-gray) !important;
    font-weight: 500;
    border: none;
    padding: 15px 20px;
}

.nav-tabs .nav-link.active {
    color: var(--primary-dark-blue) !important;
    border-bottom: 3px solid var(--gold);
    font-weight: 600;
}

.nav-tabs .nav-link:hover:not(.active) {
    color: var(--gold) !important;
    border-bottom: 3px solid transparent;
}

.tab-content {
    padding: 30px 0;
}

.download-card {
    border: 1px solid var(--light-blue-gray);
    border-radius: 6px;
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.download-icon {
    font-size: 36px;
    color: var(--primary-dark-blue);
    margin-bottom: 15px;
}

/* 隐私政策弹窗样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    opacity: 1;
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 60%;
    max-width: 700px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 60px 0;
    }

    .feature-card {
        margin-bottom: 30px;
    }

    .tech-highlight .row {
        flex-direction: column-reverse;
    }

    .tech-img {
        margin-top: 30px;
    }

    .page-header {
        padding: 40px 0;
    }

    .product-thumbnails {
        display: flex;
        justify-content: center;
        margin-top: 20px;
    }

    .modal-content {
        width: 90%;
        margin: 20% auto;
    }