/* 基础样式与响应式布局 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        padding: 10px;
    }
}
h1, h2, h3 {
    color: #002F5D;
    text-align: center;
    margin: 20px 0;
}
p {
    font-size: 1em;
    color: #555;
    text-align: justify;
}
pre {
    background: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow: auto;
    font-size: 0.9em;
}
a {
    color: #FFA500;
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover {
    color: #FF4500;
}
img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}
img:hover {
    transform: scale(1.05);
}
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 47, 93, 0.9);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.navbar a {
    margin: 0 15px;
    color: #fff;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.navbar a:hover {
    color: #FFA500;
}
.grid-item {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}
.grid-item:hover {
    transform: translateY(-5px);
}
.chart-item {
    position: relative;
    background: #e3f2fd;
    padding: 15px;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.chart-item:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.2);
}
.footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background: #002F5D;
    color: #fff;
    font-size: 0.9em;
}
.footer p {
    margin: 5px 0;
}
.animation-text {
    animation: fadeIn 2s ease-in-out;
}
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}