:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --success: #3fb950;
    --warning: #d29922;
    --border: #30363d;
    --code-bg: #0d1117;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border);
}

h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent), var(--success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1em;
}

.nav {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    padding: 15px 0;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.9em;
}

.nav a:hover, .nav a.active {
    background: var(--bg-tertiary);
    color: var(--accent);
}

section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border);
}

h2 {
    color: var(--accent);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    font-size: 1.5em;
}

h3 {
    color: var(--text-primary);
    margin: 25px 0 15px 0;
    font-size: 1.2em;
}

h4 {
    color: var(--text-secondary);
    margin: 20px 0 10px 0;
    font-size: 1em;
}

p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

strong {
    color: var(--text-primary);
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 15px 0;
    position: relative;
}

code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
    color: var(--text-primary);
}

p code, li code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8em;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

.copy-btn.copied {
    background: var(--success);
    color: white;
}

ul, ol {
    margin: 15px 0;
    padding-left: 25px;
}

li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

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

th, td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid var(--border);
}

th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

td {
    color: var(--text-secondary);
}

.highlight {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(63, 185, 80, 0.1));
    border-left: 3px solid var(--accent);
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
}

.highlight p {
    margin: 0;
}

.warning {
    background: rgba(210, 153, 34, 0.1);
    border-left: 3px solid var(--warning);
}

.info {
    background: rgba(88, 166, 255, 0.1);
    border-left: 3px solid var(--accent);
}

.tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 0;
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    font-size: 0.9em;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    display: none;
    padding-top: 20px;
}

.tab-content.active {
    display: block;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.card h4 {
    margin-top: 0;
    color: var(--accent);
}

.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.75em;
    font-weight: 600;
}

.badge-blue {
    background: rgba(88, 166, 255, 0.2);
    color: var(--accent);
}

.badge-green {
    background: rgba(63, 185, 80, 0.2);
    color: var(--success);
}

.badge-yellow {
    background: rgba(210, 153, 34, 0.2);
    color: var(--warning);
}

.collapsible {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin: 10px 0;
}

.collapsible-header {
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.collapsible-header:hover {
    background: var(--bg-secondary);
}

.collapsible-header::after {
    content: '+';
    font-size: 1.2em;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.collapsible.open .collapsible-header::after {
    content: '−';
}

.collapsible-content {
    display: none;
    padding: 0 20px 20px 20px;
}

.collapsible.open .collapsible-content {
    display: block;
}

.kbd {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 8px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85em;
    color: var(--text-primary);
    display: inline-block;
    margin: 2px;
}

footer {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
    font-size: 0.9em;
    border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
    .container {
        padding: 20px 15px;
    }

    section {
        padding: 20px;
    }

    h1 {
        font-size: 1.8em;
    }

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

    .tabs {
        flex-wrap: wrap;
    }
}