:root {
    --bg: #0b1220;
    --fg: #e5e7eb;
    --muted: #a3a8b7;
    --panel: #11192c;
    --border: #1f2a44;
    --accent: #61dafb;
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.55
}

a {
    color: var(--accent);
}

header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.bar {
    max-width: 1000px;
    margin: auto;
    display: flex;
    gap: 18px;
    align-items: center;
    padding: 10px 16px
}

.bar h1 {
    font-size: 16px;
    color: var(--fg);
    margin: 0;
    white-space: nowrap
}

nav {
    display: flex;
    gap: 12px;
    flex-wrap: wrap
}

nav a {
    color: var(--fg);
    text-decoration: none;
    font-size: 14px;
    opacity: .9
}

nav a:hover {
    color: var(--accent);
    opacity: 1
}

.wrap {
    max-width: 1000px;
    margin: auto;
    padding: 28px 16px 80px
}

h1, h2 {
    color: var(--accent);
    margin: 0 0 10px
}

h1 {
    font-size: 28px
}

h2 {
    font-size: 20px;
}

p.small {
    color: var(--muted);
    font-size: 13px
}

section {
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel);
    padding: 14px 14px 8px;
    margin: 14px 0;
    scroll-margin-top: 58px
}

pre, code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px
}

pre {
    background: #0a0f1a;
    border: 1px solid var(--border);
    padding: 10px;
    border-radius: 10px;
    overflow: auto;
    margin: 8px 0 12px
}

ul {
    margin: 6px 0 8px
}

.grid {
    display: grid;
    grid-template-columns:1fr 1fr;
    gap: 12px
}

@media (max-width: 860px) {
    .grid {
        grid-template-columns:1fr
    }
}