/* 
整体样式设计
采用未来主义风格，融合科技感与高级质感，运用CSS3的高级特性打造色彩丰富、层次分明的网页布局。
*/

/* 通用字体设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

/* 容器设置，确保响应式布局 */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 60px 0;
}

/* 标题样式 */
h1, h2, h3, h4 {
    font-family: 'Helvetica Neue', sans-serif;
    color: #00FFFF;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

/* 段落样式 */
p {
    font-size: 16px;
    color: #E0FFFF;
}

/* 链接样式 */
a {
    color: #FF4500;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #FFD700;
}

/* 图片样式 */
img.decorative {
    max-width: 100%;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.5);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(30, 60, 114, 0.8);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    z-index: 1000;
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
}

.navbar li {
    position: relative;
}

.navbar a {
    color: #FFFFFF;
    font-size: 18px;
    padding: 5px 10px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FFD700;
}

/* 主区块样式 */
.main-section {
    padding: 100px 0 50px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

/* 卡片式设计 */
.card {
    background: #2a5298;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.4);
}

/* 代码块样式 */
pre {
    background: #1e3c72;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 14px;
    color: #00FFFF;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
}

/* 按钮样式 */
.button {
    background: radial-gradient(circle, #00FF00, #008000);
    border: none;
    padding: 10px 20px;
    color: #ffffff;
    font-size: 16px;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.button:hover {
    background: radial-gradient(circle, #32CD32, #006400);
    transform: scale(1.05);
}

/* 折叠区域样式 */
.collapsible {
    background-color: #2a5298;
    color: white;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 18px;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.collapsible:hover {
    background-color: #1e3c72;
}

.content {
    padding: 0 15px;
    display: none;
    overflow: hidden;
    background-color: rgba(30, 60, 114, 0.8);
    border-radius: 0 0 10px 10px;
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 2s ease-in-out;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .navbar ul {
        flex-direction: column;
        gap: 15px;
    }
    .container {
        grid-template-columns: 1fr;
    }
}