/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Open Sans', sans-serif; /* 统一字体 */
    background: linear-gradient(135deg, #1E3A8A 70%, #3B82F6 25%, #ef4444 5%);
    color: #333333;
    line-height: 1.6;
    overflow-x: hidden; /* 防止水平滚动条出现 */
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(30, 58, 138, 0.8);
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.navbar .logo {
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
}

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

.navbar .nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-size: 16px;
    position: relative;
    transition: color 0.3s ease;
}

.navbar .nav-links a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    background: #ef4444;
    left: 0;
    bottom: -5px;
    transition: width 0.3s ease;
}

.navbar .nav-links a:hover::after {
    width: 100%;
}

@media (max-width: 768px) {
    .navbar {
        padding: 15px 20px;
    }
    .navbar .nav-links {
        display: none;
    }
}

/* 主体内容样式 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px auto; /* 留出导航栏空间 */
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.section-title {
    font-size: 32px;
    text-align: center;
    margin-bottom: 20px;
    color: #1E3A8A;
}

.card {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.2);
}

.card img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.card img:hover {
    transform: scale(1.05);
}

.card .card-content {
    padding: 15px 0;
}

.card .card-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #3B82F6;
}

.card .card-content p {
    font-size: 16px;
    color: #ffffff;
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 鼠标悬停效果 */
.button {
    background: linear-gradient(45deg, #1E3A8A, #3B82F6);
    color: #FFFFFF;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.button:hover {
    background: linear-gradient(45deg, #2563EB, #60A5FA);
    transform: scale(1.05);
}

/* 文章内容样式 */
article {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

article h2, article h3 {
    color: #1E3A8A;
}

article pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

article code {
    font-family: 'Courier New', Courier, monospace;
    color: #d6336c;
}

/* 图片样式 */
.decorative-images {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.decorative-images img {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.decorative-images img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* 提示信息样式 */
.reference-banner {
    background: rgba(255, 193, 7, 0.8);
    color: #fff;
    text-align: center;
    padding: 15px 0;
    font-size: 18px;
    position: fixed;
    top: 60px;
    width: 100%;
    z-index: 999;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar .nav-links {
        flex-direction: column;
        width: 100%;
    }
    .navbar .nav-links a {
        padding: 10px 0;
    }
    .hero-section {
        flex-direction: column;
        text-align: center;
    }
    .hero-section .hero-illustration {
        width: 100%;
    }
}