body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #282c34, #1a1a1a);
    color: #e0e0e0;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    background: linear-gradient(90deg, #ff0066, #ffcc00);
    padding: 20px 15px;
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    position: relative;
}

header::after {
    content: "这是一个网页样式设计参考";
    display: block;
    font-size: 12px;
    margin-top: 5px;
    opacity: 0.7;
}

.container {
    display: flex;
    flex-wrap: wrap;
    margin: 20px;
}

.sidebar {
    width: 25%;
    background: linear-gradient(135deg, #333, #444);
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.sidebar:hover {
    transform: scale(1.02);
}

.content {
    width: 75%;
    padding: 15px;
    background: linear-gradient(135deg, #1a1a1a, #282c34);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

h1, h2, h3 {
    font-family: 'Bebas Neue', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #ffcc00;
    margin-bottom: 15px;
}

p {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin-bottom: 15px;
    color: #d0d0d0;
}

pre {
    background: linear-gradient(135deg, #000, #1a1a1a);
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 14px;
    color: #00ff99;
    margin: 15px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

code {
    background: #000;
    padding: 2px 5px;
    border-radius: 3px;
    font-family: monospace;
    color: #00ff99;
}

span.highlight {
    background-color: #ffcc00;
    padding: 2px 5px;
    border-radius: 3px;
    color: #1a1a1a;
    font-weight: bold;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: linear-gradient(135deg, #333, #444);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

th, td {
    padding: 10px 15px;
    text-align: left;
    border: 1px solid #555;
    color: #fff;
}

th {
    background: linear-gradient(135deg, #ff0066, #ffcc00);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

td {
    background: linear-gradient(135deg, #444, #555);
}

@media (max-width: 768px) {
    .sidebar, .content {
        width: 100%;
    }

    header {
        font-size: 20px;
    }
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

@keyframes flicker {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.screen-effect {
    animation: flicker 2s infinite;
}

button {
    background: linear-gradient(135deg, #00ff99, #00cc66);
    border: none;
    padding: 10px 20px;
    color: #1a1a1a;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    transition: background 0.3s ease;
}

button:hover {
    background: linear-gradient(135deg, #00cc66, #00994d);
}

footer {
    text-align: center;
    padding: 15px;
    background: linear-gradient(135deg, #ff0066, #ffcc00);
    margin-top: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}