@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

:root {
    --primary-color: #001F3F; /* 深蓝色 */
    --secondary-color: #4B0082; /* 紫色 */
    --accent-color: #00BFFF; /* 亮蓝色 */
    --highlight-color: #FFD700; /* 金色 */
    --background-gradient: radial-gradient(circle, rgba(0,31,63,1) 0%, rgba(75,0,130,1) 70%, rgba(0,0,0,1) 100%);
    --text-color: #FFFFFF;
    --card-background: rgba(255, 255, 255, 0.1);
    --border-radius: 10px;
    --transition-speed: 0.3s;
    --font-family: 'Roboto', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    width: 100%;
    height: 100vh;
    background: var(--background-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,87,34,0.3), transparent);
    animation: aurora-move 15s linear infinite;
    z-index: 1;
}

header .content {
    position: relative;
    z-index: 2;
    padding: 20px;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--highlight-color);
}

header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
}

header a {
    display: inline-block;
    padding: 15px 30px;
    background-color: var(--accent-color);
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-speed);
}

header a:hover {
    background-color: var(--highlight-color);
}

section {
    padding: 60px 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.card {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.5);
}

.card img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius)  var(--border-radius) 0 0;
}

.card h3 {
    margin: 20px 0 10px;
    color: var(--highlight-color);
}

.card p {
    font-size: 1rem;
}

.article-section {
    padding: 60px 20px;
    background-color: rgba(0, 0, 0, 0.8);
}

.article-section h2 {
    text-align: center;
    margin-bottom: 40px;
    color: var(--highlight-color);
}

.article-section article {
    max-width: 800px;
    margin: 0 auto;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: var(--border-radius);
}

.article-section h3 {
    margin-top: 30px;
    color: var(--accent-color);
}

.article-section pre {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: var(--border-radius);
    overflow-x: auto;
}

.article-section code {
    color: #00FF00;
    font-family: 'Courier New', Courier, monospace;
}

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

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

table, th, td {
    border: 1px solid var(--accent-color);
}

th, td {
    padding: 15px;
    text-align: left;
}

th {
    background-color: var(--accent-color);
    color: var(--text-color);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }

    header p {
        font-size: 1rem;
    }

    .container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 0.9rem;
    }

    .card h3 {
        font-size: 1.2rem;
    }

    .card p {
        font-size: 0.9rem;
    }
}

@keyframes aurora-move {
    0% { transform: translate(0,0); }
    50% { transform: translate(50px, -50px); }
    100% { transform: translate(0,0); }
}