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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    color: #24292f;
    }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    }

/* Header */
header {
    background: #fff;
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid #e1e4e8;
    margin-bottom: 0px;
    }

.logo {
    font-size: 2.5rem;
    font-weight: bold;
    color: #24292e;
    margin-bottom: 10px;
    }

.tagline {
    font-size: 1.2rem;
    color: #586069;
    margin-bottom: 20px;
    }

.badges {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    }

.badge {
    background: #24292e;
    color: white;
    padding: 5px 12px;
    border-radius: 3px;
    font-size: 0.85rem;
    text-decoration: none;
    transition: background 0.2s;
    }

.badge:hover {
    background: #1b1f23;
    }

/* Main content */
main {
    background: white;
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto 40px;
    }

h1, h2, h3 {
    color: #24292e;
    margin-bottom: 20px;
    }

h1 {
    font-size: 2rem;
    border-bottom: 1px solid #e1e4e8;
    padding-bottom: 10px;
    }

h2 {
    margin-bottom: 1rem;
    }

p, ul {
    margin-bottom: 15px;
    color: #586069;
    }

ul {
    padding-left: 40px;
    }

.tabs {
    display: flex;
    border-bottom: 1px solid #d0d7de;
    margin-bottom: 1em;
    }

.tab {
    margin-right: 20px;
    padding-bottom: 6px;
    cursor: pointer;
    font-size: 14px;
    color: #1d2125;
    border-bottom: 2px solid transparent;
    }

.tab.active {
    border-bottom: 2px solid #1d2125;
    font-weight: 600;
    }

.tab:hover {
    color: #850808;
    }

.code-block {
    display: none;
    position: relative;
    }

.code-block.active {
    display: block;
    }

.language-java {
    background: #f6f8fa;
    }

pre {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
    }

code {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
    }

.code-group {
    margin-bottom: 15px;
    }

.copy-btn {
    position: absolute;
    top: 0;
    right: 0;
    padding: 4px 8px;
    margin: 6px;
    font-size: 12px;
    background-color: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    cursor: pointer;
    color: #57606a;
    transition: background-color 0.2s;
    }

.copy-btn:hover {
    background-color: #eaeef2;
    }

img {
    width: 1100px;
    }

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
        }

    main {
        padding: 20px;
        }

    .badges {
        flex-direction: column;
        align-items: center;
        }
    }