:root {
    --primary-color: #165DFF;
    --secondary-color: #0F2E68;
    --light-color: #F5F7FA;
    --dark-color: #1D2129;
    --gray-color: #86909C;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--dark-color);
    background-color: #fff;
}
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 999;
}
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
}
.nav-link {
    color: var(--dark-color);
    margin: 0 12px;
    font-weight: 500;
    transition: color 0.3s;
}
.nav-link:hover {
    color: var(--primary-color);
}
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 4px;
    font-weight: 500;
}
.btn-primary:hover {
    background-color: #0F4CD0;
    border-color: #0F4CD0;
}
.carousel-item {
    height: 600px;
    overflow: hidden;
}
.carousel-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7);
}
.carousel-caption {
    bottom: 20%;
    z-index: 2;
    text-align: left;
    max-width: 600px;
    left: 10%;
}
.carousel-caption h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
}
.carousel-caption p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #f0f0f0;
}
.section {
    padding: 80px 0;
}
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--secondary-color);
}
.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-color);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
}
.feature-card {
    background-color: var(--light-color);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}
.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}
.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-color);
}
.feature-card p {
    color: var(--gray-color);
    line-height: 1.6;
}
.faq-accordion {
    max-width: 900px;
    margin: 0 auto;
}
.accordion-item {
    margin-bottom: 15px;
    border: 1px solid #eee;
    border-radius: 8px;
    overflow: hidden;
}
.accordion-header {
    background-color: var(--light-color);
}
.accordion-button {
    font-weight: 600;
    color: var(--secondary-color);
    border: none;
    box-shadow: none;
}
.accordion-button:not(.collapsed) {
    background-color: var(--light-color);
    color: var(--primary-color);
}
.accordion-body {
    color: var(--gray-color);
    line-height: 1.6;
}
.board-member {
    text-align: center;
    margin-bottom: 40px;
}
.board-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 20px;
    border: 4px solid var(--light-color);
}
.board-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 5px;
}
.board-title {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-style: italic;
}
.board-desc {
    color: var(--gray-color);
    line-height: 1.6;
    max-width: 300px;
    margin: 0 auto;
}
.news-card {
    border: none;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}
.news-img {
    height: 200px;
    object-fit: cover;
}
.news-body {
    padding: 25px;
}
.news-date {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 10px;
    font-size: 0.9rem;
}
.news-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-color);
}
.news-desc {
    color: var(--gray-color);
    line-height: 1.6;
    margin-bottom: 20px;
}
.contact-section {
    background-color: var(--secondary-color);
    color: #fff;
}
.contact-section .section-title {
    color: #fff;
}
.contact-info {
    margin-bottom: 30px;
}
.contact-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 15px;
}
.contact-text {
    display: inline-block;
    color: #e0e0e0;
}
.footer {
    background-color: var(--dark-color);
    color: #aaa;
    padding: 50px 0 20px;
}
.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
    display: inline-block;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0 0 30px;
}
.footer-links li {
    display: inline-block;
    margin-right: 20px;
}
.footer-links a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.3s;
}
.footer-links a:hover {
    color: var(--primary-color);
}
.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    font-size: 0.9rem;
}
/* 响应式调整 */
@media (max-width: 992px) {
    .carousel-item {
        height: 450px;
    }
    .carousel-caption h1 {
        font-size: 2.2rem;
    }
    .section-title {
        font-size: 2rem;
    }
}
@media (max-width: 768px) {
    .carousel-item {
        height: 350px;
    }
    .carousel-caption {
        bottom: 10%;
    }
    .carousel-caption h1 {
        font-size: 1.8rem;
    }
    .carousel-caption p {
        font-size: 1rem;
    }
    .section {
        padding: 60px 0;
    }
    .feature-card {
        padding: 25px;
    }
}
@media (max-width: 576px) {
    .carousel-item {
        height: 280px;
    }
    .carousel-caption h1 {
        font-size: 1.5rem;
    }
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 40px;
    }
    .board-img {
        width: 150px;
        height: 150px;
    }
}