/* 基础样式设置 */
:root {
    --primary-color: #4CAF50; /* 主色调 */
    --secondary-color: #2196F3; /* 次要色调 */
    --accent-color: #FF9800; /* 强调色 */
    --background-gradient: linear-gradient(135deg, #e0f7fa, #b3e5fc);
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --text-color: #333;
    --code-bg: #f5f5f5;
    --code-border: 1px solid #ddd;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #FFA726;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.header {
    background: linear-gradient(90deg, #4CAF50, #2196F3);
    color: white;
    text-align: center;
    padding: 20px;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 2.5rem;
    margin: 0;
}

.section {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, #FF9800, #4CAF50);
}

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

.card {
    background: white;
    box-shadow: var(--card-shadow);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s ease;
    padding: 15px;
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
}

.card img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.code-block {
    background: var(--code-bg);
    border: var(--code-border);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    margin: 10px 0;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    padding: 10px;
    text-align: left;
    border: 1px solid #ddd;
}

th {
    background: #f5f5f5;
    color: var(--primary-color);
}

.footer {
    text-align: center;
    padding: 20px;
    background: linear-gradient(90deg, #2196F3, #4CAF50);
    color: white;
    margin-top: auto;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }

    .section {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 0.9rem;
    }

    .header h1 {
        font-size: 1.8rem;
    }

    .card {
        padding: 10px;
    }
}