/* 基础样式 */
body {
    font-family: 'Roboto', 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #E0F7FA;
    color: #0D47A1;
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    max-width: 1400px;
    margin: auto;
    padding: 20px;
    display: grid;
    gap: 20px;
}
header {
    background-color: #0D47A1;
    color: #fff;
    text-align: center;
    padding: 30px 20px;
    position: relative;
}
header h1 {
    font-size: 2.5em;
    margin: 0;
}
header p {
    margin: 10px 0 0;
    font-size: 1.2em;
}
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}
.card {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease;
    text-align: center;
    padding: 20px;
}
.card:hover {
    transform: translateY(-10px);
}
.card img {
    width: 100%;
    height: auto;
    object-fit: cover;
}
.card h3 {
    margin: 15px 0 10px;
    font-size: 1.5em;
    color: #0D47A1;
}
.card p {
    color: #333;
}
button {
    background-color: #1B5E20;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1em;
}
button:hover {
    background-color: #0D47A1;
    transform: scale(1.1);
}
.emphasis {
    color: #1B5E20;
    font-weight: bold;
}
article {
    background-color: #C8E6C9;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
}
article h2, article h3 {
    color: #0D47A1;
}
article pre {
    background-color: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    .cards {
        grid-template-columns: 1fr;
    }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1025px) {
    .cards {
        grid-template-columns: repeat(3, 1fr);
    }
}