/* 全局样式 */
:root {
    --primary-color: #2c5282;
    --secondary-color: #4a5568;
    --accent-color: #48bb78;
    --background-color: #f7fafc;
    --text-color: #2d3748;
    --border-color: #e2e8f0;
}

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

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

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

/* 导航栏样式 */
.navbar {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.logo span {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    background-color: rgba(44, 82, 130, 0.1);
}

.search-box {
    display: flex;
    gap: 10px;
    position: relative;
}

.search-box input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    width: 200px;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
    width: 240px;
}

.search-btn {
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-btn:hover {
    background-color: #1a365d;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--secondary-color);
    transition: all 0.3s ease;
}

/* 轮播图样式 */
.carousel {
    margin-top: 70px;
    position: relative;
    height: 500px;
    overflow: hidden;
}

.carousel-container {
    position: relative;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
    text-align: center;
}

.carousel-caption h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    transition: background-color 0.3s ease;
}

.carousel-btn:hover {
    background-color: rgba(255, 255, 255, 0.8);
}

.carousel-btn.prev {
    left: 20px;
}

.carousel-btn.next {
    right: 20px;
}

.carousel-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.carousel-dot.active {
    background-color: white;
}

/* 平台简介样式 */
.introduction {
    padding: 60px 0;
    background-color: white;
}

.introduction h2 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 30px;
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    color: var(--secondary-color);
}

/* 快速入口样式 */
.quick-access {
    padding: 60px 0;
    background-color: var(--background-color);
}

.quick-access h2 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 40px;
}

.access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.access-card {
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.access-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.access-card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.access-card p {
    color: var(--secondary-color);
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.footer-section p {
    margin-bottom: 10px;
}

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

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

.footer-section a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-section a:hover {
    opacity: 0.8;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    padding: 8px 16px;
    border: 1px solid white;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: white;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 15px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: white;
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        flex-direction: column;
    }

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

    .nav-links a {
        width: 100%;
        text-align: center;
    }

    .search-box {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .carousel {
        height: 300px;
        margin-top: 60px;
    }

    .carousel-caption h2 {
        font-size: 1.5rem;
    }

    .carousel-caption p {
        font-size: 1rem;
    }

    .access-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}