/* 全局样式 */
:root {
    --primary-color: #0074D9; /* 深蓝色 */
    --secondary-color: #111111; /* 太空黑 */
    --accent-color: #39FF14; /* 荧光绿 */
    --background-gradient: linear-gradient(135deg, #001f3f, #111111);
    --text-color: #FFFFFF;
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    margin-bottom: 30px;
}

header h1 {
    font-family: var(--font-secondary);
    font-size: 2.5em;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

article {
    background: rgba(0, 0, 0, 0.7);
    padding: 20px;
    border-radius: 10px;
}

article h2, article h3, article h4 {
    color: var(--accent-color);
    margin-bottom: 15px;
}

article h2 {
    font-size: 2em;
}

article h3 {
    font-size: 1.5em;
}

article h4 {
    font-size: 1.2em;
}

article p {
    margin-bottom: 15px;
    font-size: 1em;
    line-height: 1.8;
}

pre {
    background: #1a1a1a;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 15px;
}

code {
    color: var(--accent-color);
    font-family: 'Courier New', Courier, monospace;
}

.image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.image-gallery img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 5px;
}

.footer {
    text-align: center;
    padding: 20px;
    margin-top: 30px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    font-size: 1.2em;
}

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

a:hover {
    color: var(--primary-color);
}

@media (min-width: 320px) and (max-width: 480px) {
    header h1 {
        font-size: 2em;
    }
    article h2 {
        font-size: 1.8em;
    }
    article h3 {
        font-size: 1.3em;
    }
    .image-gallery img {
        max-width: 100%;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 1025px) and (max-width: 1200px) {
    .container {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

@media (min-width: 1201px) {
    .container {
        grid-template-columns: repeat(4, 1fr);
    }
}